Zero Spot

Spray. Wipe. Done. Zero Spot is a professional-grade acid spot remover for the stains a wash can't touch — severe hard water spots, mineral damage, rust staining, and the yellow scum line on gelcoat, glass, and stainless. Towel on, wipe off, no heavy scrubbing.

Made by working detailers in the USA.

Why Acid

Water spots and rust stains are minerals bonded to the surface. Soap can't dissolve minerals — acid can. Zero Spot breaks that bond in seconds, so the stain wipes away instead of getting polished in. Because it's strong, it's built for spot work: towel on, short dwell, wipe off, wash.

How to Use

Spot treat

1. Put on chemical-resistant gloves (nitrile or neoprene) and eye protection.
2. Work on a cool surface, out of direct sun.
3. Spray Zero Spot onto a clean microfiber towel — not directly on the surface.
4. Wipe it onto the stain and let it sit 30 seconds. No longer.
5. Wipe clean with a second, damp microfiber.
6. Wash the area with Strip Tide and rinse thoroughly with fresh water.
7. Re-protect with Boost Coat once dry.

Safe to Use On / Do Not Use On

✅ Safe on: cured marine gelcoat · fiberglass · stainless steel · standard clear glass (for severe mineral spots, when nothing else works) · waterline scum lines

❌ Do not use on: tinted, mirrored, or coated specialty glass (common on some luxury yachts — it will damage the finish) · mirrors · plastic, acrylic, and isinglass · anodized or bare aluminum · zinc, tin, and galvanized metal · painted or clear-coated surfaces (test first) · hot surfaces or direct sun

When in doubt, test in a hidden area first.

Never Mix With

• Bleach or chlorine cleaners — including Cast Off. Releases toxic gas.
• Alkaline products — Grease Gone, Grease Gone Pro, Sea Lift. Wash and rinse between products.
• Ammonia-based cleaners.

Pro Tips From the Field

• Towel, not the surface. You control exactly where the acid goes — and nothing drips onto trim below.
• 30 seconds is plenty. Longer dwell doesn't clean better on a fresh spot. Hit it again instead.
• Last resort on glass. Try Reel Clean first. Save Zero Spot for severe mineral damage — and never on tinted or mirrored glass.
• Work small. One stain or one small section at a time, then wipe.
• Always wash it off. Strip Tide and a fresh-water rinse remove any acid left in the gelcoat pores.
• Re-protect. Acid removes wax along with the spot. A mist of Boost Coat puts it back.
• Yellow waterline? Use the Scum Line Cleaning System — Zero Spot, Strip Tide, and Boost Coat in order.

Pairs With

• Strip Tide — wash the area clean after spot treating
• Boost Coat — re-protect the treated area
• Water Spot Removal & Protection System — Zero Spot + Strip Tide + Boost Coat
• Scum Line Cleaning System — knock out the yellow waterline

Safety & SDS

DANGER — strong acid. Contains ammonium bifluoride, which forms hydrofluoric acid in water. Always wear chemical-resistant gloves (nitrile or neoprene, not latex) and eye protection. If it touches skin or eyes, rinse with plenty of water and get medical attention right away — burns can be delayed. Keep out of reach of children. Use the Download SDS button below for full safety information.