Hull (fiberglass)Marine soap or Boat Juice — 2 oz per gal. Soft brush + low pressure rinse.
Waterline stainsStar Brite or On & Off Hull Cleaner (acid-based) — straight, dwell 1–2 min, scrub, rinse fast
Wood dockSH 1% + surfactant for algae/mildew. 1,500–2,000 PSI, 40° tip, with the grain.
AluminumNO acid cleaners on aluminum — will pit and oxidize. Use marine soap only.
PressureFiberglass: <1,500 PSI. Dock planks: up to 2,500 PSI.
Watch outCheck for anti-fouling paint on hull bottom — do NOT pressure wash it off.
💡 Rinse everything into the water away from the boat. Dispose of acid cleaner wastewater per marina rules.