Thetford RV Black Streak & Bug Remover — 64 oz biodegradable cleaner safe on gelcoat

Thetford Premium RV Black Streak & Bug Remover is a heavy-duty cleaner formulated to lift black streaks, sun-baked insect residue, and other stubborn soils from vehicle exteriors without harming gelcoat or most painted surfaces.

Keep your RV, boat, or vehicle looking sharp with a product engineered specifically for exterior stains that common soaps can't remove. This 64-ounce formula targets black streaks and embedded bug residue using a biodegradable, non-flammable alkaline detergent blend. It’s formulated to be safe on gelcoat, fiberglass, decals, and painted aluminum when used as directed, but because it’s a potent cleaner, a spot test is recommended on older or weathered finishes.

How does it remove black streaks and bug residue so effectively?

The formulation penetrates film-like deposits and lifts organic and carbon-based soils so they can be wiped or rinsed away. It works faster than general-purpose soaps because of its alkaline cleaning agents designed for exterior grime. Use it on cool, shaded surfaces for best performance and to reduce streaking.

• Alkaline detergents break down stubborn deposits
• Gel-like consistency clings to vertical surfaces for longer dwell time
• Fast action on baked-on bugs and streaking around vents and seals

What surfaces is it safe to use on, and what precautions should I take?

It’s formulated to be safe on gelcoat, fiberglass, painted aluminum and most decals when applied correctly. Avoid prolonged contact on untested or brittle surfaces and always spot-test in an inconspicuous area. Do not let the product dry on surfaces and rinse or wipe promptly as instructed.

• Safe for RV gelcoat, fiberglass, decals, and painted metal
• Not recommended for unfinished or weathered rubber and some plastics without testing
• Rinse or wipe off immediately after dwell time to avoid surface damage

How do I use Thetford Black Streak & Bug Remover for best results?

Start with a clean, dry surface and work in the shade to prevent rapid evaporation. Apply with a clean cloth, scrub sponge or soft brush, allow a short dwell period, then wipe or rinse thoroughly. For vertical stains, use moderate pressure and repeat if needed for deep-set deposits.

• Spot-test first on older finishes
• Apply with cloth or sponge; allow brief dwell time
• Wipe or rinse promptly; avoid sun-exposed surfaces during application

Does this product have environmental or safety benefits?

Thetford’s formula is non-flammable and 100% biodegradable, which reduces environmental impact compared with solvent-based cleaners. It’s effective without harsh solvents, but because it is alkaline and concentrated, follow label safety steps like wearing gloves and eye protection if needed.

• 100% biodegradable formula
• Non-flammable, non-toxic cleaning composition
• Use protective gloves on prolonged exposure

Who is this for: Thetford Premium RV Black Streak & Bug Remover is designed for RV owners, boaters, and vehicle enthusiasts who need a targeted solution for black streaks and baked-on insect residue. It’s ideal for those who maintain fiberglass and gelcoat surfaces, manage seasonal vehicle cleanups, or want a reliable stain remover that balances strength with biodegradability. If you maintain older or delicate finishes, plan to spot-test before full application to protect surface integrity.

Ingredients

Propylene Glycol Butyl Ether, Propylene Glycol 2-Butyl Ether, water, Capryl Glucoside, Lauryl Glucoside, Tetrasodium Iminodisuccinate, Aspartic acid, disodium salt 2-Butenedioic acid E-, disodium salt, Sodium Borate, Methylchloroisothiazolinone, Methylisothiazolinone, Magnesium Chloride, Magnesium Nitrate