303 30586 Boat Wash 32 oz | Ultra-Concentrated pH Neutral Wash for Gel Coat, Fiberglass & Paint

303 30586 Boat Wash 32 oz — Ultra-Concentrated, pH Neutral, 100% Biodegradable Marine Wash for Gel Coat, Fiberglass & Painted Surfaces

303 Boat Wash is an ultra-concentrated, pH neutral boat wash formulated specifically for gel coat, fiberglass, and painted marine surfaces. The concentrated formula removes dirt, grime, and salt accumulation efficiently and rinses clean without stripping existing wax or protectant treatments from the surface. 100% biodegradable and marine safe — the formula is designed for use in marina environments where wash water runoff is a consideration. Stain-free formula leaves no residue. A single 32 oz bottle yields significantly more wash solution than non-concentrated alternatives, making it a cost-effective primary wash for any vessel.

Part Specifications

• Part Number: 303-30586
• Size: 32 oz concentrate
• Formula: Ultra-concentrated — dilute before use per label instructions
• pH: Neutral — safe for waxed, sealed, and coated surfaces; will not strip existing wax or protectant layers
• Biodegradability: 100% biodegradable, marine safe
• Residue: Stain-free, no residue after rinsing
• Safe Surfaces: Gel coat, fiberglass, painted surfaces
• Removes: Dirt, grime, salt accumulation, surface stains

About 303 Products

303 has been producing specialty vehicle and marine care formulations for over 40 years, with testing conducted in extreme conditions globally. The brand is known for balanced-pH, substrate-safe formulations that deliver professional-grade results across marine, automotive, RV, powersports, and aviation applications. 303 Boat Wash is the dedicated wash step in the 303 marine care system — designed to be used before applying 303 protectants, waxes, or coatings (Aerospace Protectant, Quick Wax, SiO2 Touchless Sealant, or Graphene Nano Coating) for a complete wash-and-protect routine.

Application Notes

• Dilute per label instructions before use — do not apply concentrate directly to the hull surface
• Apply with a wash mitt, soft brush, or sponge in overlapping passes; work from top to bottom to prevent dirty water from running over cleaned areas
• Rinse thoroughly with fresh water — the pH neutral formula rinses clean without residue or streaking
• Safe to use on waxed, sealed, or graphene-coated surfaces — the neutral pH will not degrade or strip existing protective layers
• 100% biodegradable — suitable for marina use where wash water enters waterways; check local marina regulations for wash water discharge requirements
• After washing, follow with 303 Aerospace Protectant (vinyl/rubber/plastic/carbon fiber) or 303 Quick Wax / SiO2 Touchless Sealant / Graphene Nano Coating (gel coat/paint) to restore or maintain UV protection on cleaned surfaces

Additional Information

• Vendor: 303
• SKU: 303-30586
• Product Type: Boat & Engine Maintenance / Boat Wash
• Size: 32 oz concentrate
• Country of Origin: USA
• HS Code: 3402.20 (cleaning preparations put up for retail sale — verify for your import classification)

Frequently Asked Questions

Q: Is this product safe to use on a waxed hull without stripping the wax?
A: Yes — 303 Boat Wash is pH neutral, which means it will not chemically strip or degrade carnauba wax, SiO2 sealant, or graphene coating layers applied to the hull. Many boat wash products use alkaline detergents that break down wax over time. A pH neutral wash preserves your existing protective layers and is the correct wash product to use when you want to maintain, not remove, the protectant on your boat’s surfaces.

Q: How concentrated is this formula? How much do I dilute it?
A: 303 Boat Wash is ultra-concentrated — a small amount of product goes a long way. Follow the dilution instructions on the product label for the recommended wash-to-water ratio. Typical concentrated boat washes dilute at 1–2 oz per gallon of water; refer to the label for the exact ratio for this product.

Q: Is this product biodegradable and safe for use at a marina?
A: Yes — 303 Boat Wash is 100% biodegradable and marine safe. It is formulated for use in marina environments where wash water runoff enters the water. Always check your local marina’s specific regulations regarding wash water discharge, as requirements vary by location and jurisdiction.

Q: Can I use this on a painted hull or a gelcoat hull?
A: Yes — 303 Boat Wash is specifically designed for painted surfaces, gel coat, and fiberglass. The pH neutral formula is safe for all standard above-waterline boat exterior finishes. For antifouling bottom paint below the waterline, consult the paint manufacturer’s guidance on compatible wash products.

Q: Should I apply a protectant after washing with this product?
A: Yes — washing removes surface contamination but does not restore UV protection on cleaned surfaces. After washing, apply 303 Aerospace Protectant to vinyl, rubber, plastic, and carbon fiber surfaces; apply 303 Quick Wax (303-30213), SiO2 Touchless Sealant, or Graphene Nano Coating (303-30251) to gel coat and painted surfaces to restore or maintain UV and environmental protection.