{"product_id":"cast-off-mold-mildew-stain-remover","title":"Cast Off - Mold \u0026 Mildew Stain Remover","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eCast Off is a \u003cspan style=\"background-color: rgb(255, 255, 0);\"\u003eprofessional-strength stain remover\u003c\/span\u003e specially formulated to lift mildew stains, treat organic discoloration, hull streaking, and waterline staining. Cast off is safe to use on everything from white gelcoat, and fiberglass, to a variety of other compatible marine surfaces.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eBuilt on a \u003cspan style=\"text-decoration: underline;\"\u003echlorine-based formula\u003c\/span\u003e, specifically formulated for tough marine environments, Cast Off attacks the stains other cleaners can't touch; fast, on contact, without scrubbing. Our formula is tough on stain but not on the environment. \u003cstrong\u003eCast off is Water Soluble, and Biodegradable\u003c\/strong\u003e, making it the perfect addition to your vessels steward cabinet. \u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cspan style=\"background-color: rgb(255, 255, 0);\"\u003e\u003cstrong\u003eSend stains overboard.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\" dir=\"ltr\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/span\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\" role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003e-\u003c\/strong\u003e Removes mold, mildew, and organic stains on contact\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\" role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003e- \u003c\/strong\u003eFormulated for marine vinyl, canvas, and boat interiors\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\" role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003e- \u003c\/strong\u003eStops mildew from spreading to surrounding surfaces\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\" role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003e- \u003c\/strong\u003eRestores surfaces back to clean without heavy scrubbing\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003e\u003cstrong\u003e- \u003c\/strong\u003eMade by detailers \u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan style=\"background-color: rgb(255, 255, 0);\"\u003e\u003cstrong\u003e- Made in the USA\u003c\/strong\u003e\u003c\/span\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003e\u003cstrong\u003eHow to Use\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e⚠️ \u003cspan style=\"background-color: rgb(255, 255, 0);\"\u003eDO NOT use Cast Off and Grease Gone together, or\u003c\/span\u003e on the same surface in the same session. \u003c\/strong\u003eRinse thoroughly between products. Allow surfaces to fully dry before applying a different Mad Soaps product.\u003cstrong\u003e ⚠️\u003c\/strong\u003e\u003c\/p\u003e\n\u003col class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-decimal flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eGear up.\u003c\/strong\u003e Wear protective gloves, eye protection, and clothing you don't care about. Cast Off will bleach fabrics on contact.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eWork outdoors or in a well-ventilated area.\u003c\/strong\u003e Cast Off releases chlorine vapors during use.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eSurface must be cool and shaded.\u003c\/strong\u003e Heat accelerates off-gassing and shortens product life on the surface.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003ePre-wet surrounding metals and unprotected surfaces\u003c\/strong\u003e to dilute any drip-off.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eSpray Cast Off directly onto the stained surface.\u003c\/strong\u003e Coat evenly.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eDwell 1–5 minutes.\u003c\/strong\u003e Stubborn stains may need longer — but watch for the stain to lift, then rinse.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eAgitate gently with a soft brush\u003c\/strong\u003e if needed. Never use stiff bristles on gelcoat or vinyl.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eRinse thoroughly with fresh water.\u003c\/strong\u003e Flood-rinse the entire treated area and any nearby surfaces.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eRepeat for heavy staining.\u003c\/strong\u003e Multiple short applications outperform one long dwell.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eReapply protection.\u003c\/strong\u003e Cast Off strips wax, sealants, and surface protectants.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eReady-to-use formula. No dilution required.\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003e🚨 \u003cstrong\u003eNEVER MIX WITH:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cspan style=\"text-decoration: underline; background-color: rgb(255, 255, 0);\"\u003e\u003cstrong\u003eMixing Cast Off with the following produces\u003c\/strong\u003e \u003cstrong\u003etoxic chlorine or chloramine gas\u003c\/strong\u003e:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eAcidic cleaners\u003c\/strong\u003e — vinegar, citric acid, lime\/scale removers, rust removers, hull cleaners, toilet bowl cleaners\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eAmmonia-based cleaners\u003c\/strong\u003e — many glass and surface cleaners contain ammonia\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eOther Mad Soaps products\u003c\/strong\u003e — until you confirm compatibility\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\u003cstrong\u003ePool chemicals\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eAny \"natural\" or unlabeled cleaning product\u003c\/strong\u003e of unknown chemistry\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eIf you smell a sharp, sour, or chlorine-like odor more intense than the product itself — stop, ventilate, leave the area, and rinse the surface with large amounts of fresh water.\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003e✅ \u003cstrong\u003eSafe to Use On\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eWhite gelcoat\u003c\/strong\u003e (the primary use case)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" style=\"font-weight: bold;\"\u003e\u003cstrong\u003eWhite or light-colored fiberglass hulls\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eWhite vinyl boat upholstery\u003c\/strong\u003e (test first — colored vinyl may bleach)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eWhite canvas covers and bimini tops \u003c\/strong\u003e(test first)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" style=\"font-weight: bold;\"\u003e\u003cstrong\u003eWhite awnings\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eConcrete pads and dock surfaces\u003c\/strong\u003e (may lighten colored concrete)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" style=\"font-weight: bold;\"\u003e\u003cstrong\u003eWhite tile and grout\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" style=\"font-weight: bold;\"\u003e\u003cstrong\u003ePorcelain\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eGlass\u003c\/strong\u003e (rinse promptly)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" style=\"font-weight: bold;\"\u003e\u003cstrong\u003eWhite or light plastic boat trim\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003e❌ \u003cstrong\u003eDo NOT Use On\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eSodium hypochlorite bleaches colors and reacts with metals. Avoid:\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eAny colored fabric, upholstery, or canvas\u003c\/strong\u003e — will bleach permanently\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eAluminum\u003c\/strong\u003e (any grade — reacts and pits)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eStainless steel\u003c\/strong\u003e (extended exposure causes pitting and corrosion)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eBrass, bronze, and copper fittings\u003c\/strong\u003e (corrodes and tarnishes)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eGalvanized metal\u003c\/strong\u003e (strips zinc coating)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eAnodized aluminum\u003c\/strong\u003e (strips anodizing)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eZinc anodes\u003c\/strong\u003e (degrades)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eCarbon steel\u003c\/strong\u003e (corrodes rapidly)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003ePolished metals\u003c\/strong\u003e (will dull and pit)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eDark Colored marble, granite, and natural stone\u003c\/strong\u003e (etches the surface)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eWood, teak, or wood veneer\u003c\/strong\u003e (bleaches and dries)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eLeather upholstery\u003c\/strong\u003e (causes permanent damage)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eVinyl wraps, decals, and graphics\u003c\/strong\u003e (fades colors)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eDark carpet\u003c\/strong\u003e (removes color)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eTinted windows\u003c\/strong\u003e (damages tint film)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eAcrylic and polycarbonate\u003c\/strong\u003e (clouds and degrades)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eRubber gaskets and seals\u003c\/strong\u003e (degrades over time)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\u003cstrong\u003eCarbon fiber components\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003ePainted brightwork or decorative finishes\u003c\/strong\u003e\u003cstrong\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cspan style=\"background-color: rgb(255, 255, 0);\"\u003e\u003cstrong\u003eRule of thumb:\u003c\/strong\u003e If color matters or it's metal, mask it, move it, or skip it.\u003c\/span\u003e \u003cstrong\u003eIf in doubt, test in an inconspicuous area first.\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003e\u003cstrong\u003ePro Tips from the Field\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eSpot test, every time.\u003c\/strong\u003e On colored canvas, painted gelcoat, or any non-white surface — apply a small amount in an inconspicuous spot, wait 5 minutes, rinse, and inspect before treating the full area.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eMask off zinc anodes and metal fittings\u003c\/strong\u003e with tape and plastic sheeting before working on hulls.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003ePre-wet surrounding metals\u003c\/strong\u003e so any overspray or drip is diluted immediately.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eWork top-down on vertical surfaces\u003c\/strong\u003e so any runoff goes onto areas you're about to treat anyway.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eMultiple short applications beat one long dwell.\u003c\/strong\u003e Apply, dwell 2 minutes, rinse, then reapply if needed.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eFor deep mildew staining in vinyl\u003c\/strong\u003e, agitate gently with a soft detail brush.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eFor hull waterline stains\u003c\/strong\u003e, dwell 1–3 minutes and rinse before the bleach has time to attack any underlying metals (rub rails, through-hulls, anodes).\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eFor canvas\u003c\/strong\u003e, lay flat in shade, soak the stained area, keep moist for 2–3 minutes, then flood-rinse with a garden hose.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eNever let Cast Off dry on a surface.\u003c\/strong\u003e If it dries before rinsing, the bleached effect can become permanent.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eRinse with fresh water, not seawater.\u003c\/strong\u003e Saltwater leaves deposits.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eWork in shade, in cool conditions.\u003c\/strong\u003e Heat accelerates chlorine off-gassing — you'll smell more and breathe more.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eVentilate.\u003c\/strong\u003e Open hatches, port lights, and doors when working in interior spaces. Use a fan if needed.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eReapply protectant\u003c\/strong\u003e to anything you cleaned - vinyl protectant, wax, sealant, fabric water repellent. \u003cspan style=\"text-decoration: underline;\"\u003eGrab a bottle of \u003cstrong\u003eBoost Coat\u003c\/strong\u003e at checkout.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eStorage matters:\u003c\/strong\u003e Keep Cast Off cool and out of sunlight. Heat and UV degrade sodium hypochlorite — store above 40°F and below 90°F, and use within 12 months of opening. \u003cb id=\"docs-internal-guid-4b1d79d9-7fff-d603-6833-ad96dfaaeabc\"\u003e\u003c\/b\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MAD Soaps","offers":[{"title":"16 Oz","offer_id":55912334393666,"sku":"MAD-CAST-005","price":12.99,"currency_code":"USD","in_stock":true},{"title":"1 Gal","offer_id":55912334426434,"sku":"MAD-CAST-027","price":24.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/1839\/6738\/files\/ChatGPTImageMay23_2026_10_48_53AM_1.png?v=1786636755","url":"https:\/\/sailboatparts.com\/products\/cast-off-mold-mildew-stain-remover","provider":"Sailboat Parts","version":"1.0","type":"link"}