Cast Off - Mold & Mildew Stain Remover

Cast Off is a professional-strength stain remover 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.

Built on a chlorine-based formula, 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. Cast off is Water Soluble, and Biodegradable, making it the perfect addition to your vessels steward cabinet. 

Send stains overboard.

Key Features:

- Removes mold, mildew, and organic stains on contact

- Formulated for marine vinyl, canvas, and boat interiors

- Stops mildew from spreading to surrounding surfaces

- Restores surfaces back to clean without heavy scrubbing

- Made by detailers

- Made in the USA

How to Use

⚠️ DO NOT use Cast Off and Grease Gone together,or on the same surface in the same session. Rinse thoroughly between products. Allow surfaces to fully dry before applying a different Mad Soaps product. ⚠️

1. Gear up. Wear protective gloves, eye protection, and clothing you don't care about. Cast Off will bleach fabrics on contact.
2. Work outdoors or in a well-ventilated area. Cast Off releases chlorine vapors during use.
3. Surface must be cool and shaded. Heat accelerates off-gassing and shortens product life on the surface.
4. Pre-wet surrounding metals and unprotected surfaces to dilute any drip-off.
5. Spray Cast Off directly onto the stained surface. Coat evenly.
6. Dwell 1–5 minutes. Stubborn stains may need longer — but watch for the stain to lift, then rinse.
7. Agitate gently with a soft brush if needed. Never use stiff bristles on gelcoat or vinyl.
8. Rinse thoroughly with fresh water. Flood-rinse the entire treated area and any nearby surfaces.
9. Repeat for heavy staining. Multiple short applications outperform one long dwell.
10. Reapply protection. Cast Off strips wax, sealants, and surface protectants.

Ready-to-use formula. No dilution required.

🚨 NEVER MIX WITH:

Mixing Cast Off with the following produces toxic chlorine or chloramine gas:

• Acidic cleaners — vinegar, citric acid, lime/scale removers, rust removers, hull cleaners, toilet bowl cleaners
• Ammonia-based cleaners — many glass and surface cleaners contain ammonia
• Other Mad Soaps products — until you confirm compatibility
• Pool chemicals
• Any "natural" or unlabeled cleaning product of unknown chemistry

If 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.

✅ Safe to Use On

• White gelcoat (the primary use case)
• White or light-colored fiberglass hulls
• White vinyl boat upholstery (test first — colored vinyl may bleach)
• White canvas covers and bimini tops (test first)
• White awnings
• Concrete pads and dock surfaces (may lighten colored concrete)
• White tile and grout
• Porcelain
• Glass (rinse promptly)
• White or light plastic boat trim

❌ Do NOT Use On

Sodium hypochlorite bleaches colors and reacts with metals. Avoid:

• Any colored fabric, upholstery, or canvas — will bleach permanently
• Aluminum (any grade — reacts and pits)
• Stainless steel (extended exposure causes pitting and corrosion)
• Brass, bronze, and copper fittings (corrodes and tarnishes)
• Galvanized metal (strips zinc coating)
• Anodized aluminum (strips anodizing)
• Zinc anodes (degrades)
• Carbon steel (corrodes rapidly)
• Polished metals (will dull and pit)
• Dark Colored marble, granite, and natural stone (etches the surface)
• Wood, teak, or wood veneer (bleaches and dries)
• Leather upholstery (causes permanent damage)
• Vinyl wraps, decals, and graphics (fades colors)
• Dark carpet (removes color)
• Tinted windows (damages tint film)
• Acrylic and polycarbonate (clouds and degrades)
• Rubber gaskets and seals (degrades over time)
• Carbon fiber components
• Painted brightwork or decorative finishes

Rule of thumb: If color matters or it's metal, mask it, move it, or skip it. If in doubt, test in an inconspicuous area first.

Pro Tips from the Field

• Spot test, every time. 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.
• Mask off zinc anodes and metal fittings with tape and plastic sheeting before working on hulls.
• Pre-wet surrounding metals so any overspray or drip is diluted immediately.
• Work top-down on vertical surfaces so any runoff goes onto areas you're about to treat anyway.
• Multiple short applications beat one long dwell. Apply, dwell 2 minutes, rinse, then reapply if needed.
• For deep mildew staining in vinyl, agitate gently with a soft detail brush.
• For hull waterline stains, dwell 1–3 minutes and rinse before the bleach has time to attack any underlying metals (rub rails, through-hulls, anodes).
• For canvas, lay flat in shade, soak the stained area, keep moist for 2–3 minutes, then flood-rinse with a garden hose.
• Never let Cast Off dry on a surface. If it dries before rinsing, the bleached effect can become permanent.
• Rinse with fresh water, not seawater. Saltwater leaves deposits.
• Work in shade, in cool conditions. Heat accelerates chlorine off-gassing — you'll smell more and breathe more.
• Ventilate. Open hatches, port lights, and doors when working in interior spaces. Use a fan if needed.
• Reapply protectant to anything you cleaned - vinyl protectant, wax, sealant, fabric water repellent. Grab a bottle of Boost Coat at checkout.
• Storage matters: 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. 

Safety & First Aid

Cast Off contains sodium hypochlorite (12–14%). It is corrosive and produces chlorine vapors.

Always wear:

• Chemical-resistant gloves (rubber, nitrile, or neoprene)
• Sealed eye protection or full face shield
• Old clothing — Cast Off will bleach fabric on contact
• Closed-toe shoes

Work in well-ventilated areas. Use respiratory protection (NIOSH-approved mask) when working in enclosed spaces.

If exposed:

• Eyes: Flush immediately with running water for at least 15 minutes. Remove contact lenses if present and easy to do. Continue rinsing. See a physician immediately.
• Skin: Flush with water for at least 15 minutes. Remove contaminated clothing. See a physician if irritation persists.
• Inhaled: Remove person to fresh air. Keep comfortable for breathing. See a physician if symptoms develop.
• Swallowed: Dilute stomach contents with water if conscious. Do NOT induce vomiting. Call Poison Control (1-800-222-1222) and see a physician immediately.

If chlorine gas exposure occurs (from accidental mixing): Evacuate the area immediately. Get to fresh air. Call 911 if breathing is affected. Do not re-enter the area until ventilated.

Emergency (24 hr): CHEMTREC (800) 424-9300

Poison Control: 1-800-222-1222

Storage & Disposal

• Store in a cool, dark, well-ventilated place between 40°F and 90°F.
• Do not allow to freeze (freeze point: 32°F).
• Do not store in direct sunlight — UV degrades sodium hypochlorite rapidly.
• Keep container tightly closed. Store locked up, away from children and pets.
• Store away from acids, ammonia, and other cleaning products.
• Do not pour down drains, into storm drains, or into waterways. Harmful to fish and aquatic organisms.
• Dispose of contents and container in accordance with local, state, and federal regulations.
• For empty containers: rinse thoroughly with water before disposal or recycling.

Safety Data Sheet (SDS)