Star brite Instant Hull Cleaner uses a naturally derived oxalic acid formula to cut through rust, dried fish blood, and leaf stains on fiberglass, plastic, and painted hull surfaces — no aggressive chemicals required. Shake the bottle, wipe it on with a sponge or sprayer, wait two minutes, and rinse with fresh water. For heavily soiled surfaces a second pass with light scrubbing does the job. Follow up with Star brite Premium Marine Polish to restore gloss and extend protection.

Specifications:

• Size: 32 oz
• Formula: Oxalic acid-based, naturally effective
• Compatible surfaces: Fiberglass, plastic, and painted boat hulls
• Removes: Rust, dried fish blood, leaf stains, and tough hull stains
• Application method: Sponge or sprayer
• Dwell time: 2 minutes before rinsing
• Rinse: Fresh water
• Severely stained surfaces may require a second application and light scrubbing
• Recommended use temperature: 50°F (10°C) or warmer
• Rubber gloves recommended during use
• Recommended follow-up: Star brite Premium Marine Polish for shine and protection

⚠️ California Prop 65 Warning: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.