Sail Cleaning .... DIY
IF and ONLY if the sail is *white* dacron .....Thoroughly clean the deck of the boat. Get a 'sodium silicate' based detergent .. Spray bottles. Product I used is called 'Tuff-eNuff' .... used to be available at West Marine. Sodium Silicates are strong caustic cleaners usually available from a janitorial supply. Such detergents are highly caustic so be sure to wear appropriate personal protection: goggles, gloves, etc. On a windless, cloudy and humid day ......Raise the sail from the deck while spraying on detergent, then drop to deck and cover with plastic tarp, etc. let soak for 1 or more hours. Slowly raise sail while scrubbing with a long handled soft bristle brush, use a water hose and 'mist' the sail with water to keep wet. Do both sides. Mist the sail with water when fully raised, drop to deck and cover and let soak. Slowy raise looking for areas not beginning to 'clean' and respray /scrub with detergent + scrubbing, drop sail and recover. Scrub the sail again while raising/lowering. Soak time is important to allow the air pollution and fungus (usually 'artillery fungus' ... those teeny black spots) to disolve. With hose in hand slowly raise sail to rinse, raise and lower while blasting with water several time to be SURE that all detergent is removed. Inspect sail for 'rust/iron/tannin' stains. If so, use full strength mix of oxalic acid (with precautions) and work the local areas so stained, then rinse and rinse and rinse. Obtain Oxalic crystals from a hardware/paint store. Dont allow oxalic or oxalic solution to touch your skin - will absorb and seriously harm your kidneys.To dry the sail, go sailing. When back at the deck, re-wax the boat as the caustic will have stripped ALL the old dead wax from the fiberglass (a good idea to do every 2 years). Dont do this 'method' if the boat is painted ... may 'lift' the paint. hope this helps