DIY Sail cleaning
Directions for cleaning WHITE ***dacron**** or dacron laminate sails:Obtain a sodium silicate based liquid detergent (janitorial supply or sometimes from a chandlery as Tuff-eNuff) and some oxalic acid crystals from a hardware/paint store. Caution: Sodium Silicates are stongly caustic; oxalic acid rapidly absorbs though exposed skin ..... so wear proper protectionOn a cloudy, windless and humid day ....Clean the deckSlowly raise the sail as you spray/spritz on the detergent, mist with water from a hose to keep wetted. Continue until sail is fully coated with detergent and water, lower to deck and cover with a waterproof tarp to keep from drying out. LET SOAK for about an hour.With long handled soft bristle brush slowly raise sail as you scrub the surface, apply more detergent where needed until whole sail is scrubbed and recoated. Lower and cover with tarp and LET SOAK. Slowly raise again and scrub ... then re-raise and blast with hose to totally rinse all detergent from sail. Raise and lower several times while blating with water hose until ALL detergent is removed. Sodium Silicate or other strong caustics will not harm dacron or the polyester seam stitching. And it will dissolve the cellular structure of mildew, 'artillery fungus' (teeny black spots all over gelcoat and sailcloth) air pollution spots, etc. ... these are the 'usual' cause of 'dirt' on a sail. Make sure the sail is well rinsed. ------------For tannin and rust stain removal (be SURE there is NO caustic left in sail) See oxalic acid caution above as if this stuff gets absorbed it can seriouslly harm your kidneys (oxalic is the MAIN component in teak/wood bleach and many of the vogue cleaners/cleansers now marketed and available in 'supermarkets, etc. ---- BAD SHIT for human kidneys)Dissolve the oxalic acid crystals in warm water ... just enough water so that 'most' of the crustals (but not all() dissolve. Apply to tannin and rust stains with long handled brush .... if tannin or iron stan, will bleach almost immediately. RINSE RINSE RINSE AND THEN RINSE AGAIN. Go sailing to dry the sail. Then rewax the boat as the Sodium Silicate will have stripped all the old dead wax from the pores of the gelcoat. Good to strip the old wax every year to retard oxidation acceleration due to old dead wax. Then take remaining oxalic acid and wash/bleach the waterline and engine exhaust outlets to remove the 'bow moustache' and waterline stains from tannins and rust, etc. Then reseal/wax the gelcoat on the topsides and waterline. Three jobs done on same morning .... Costs about $15.00.Sail should now be quite clean and stain free. Be VERY careful using organic solvents to remove grease,oil from sailcloth as such solvents can disolve the plasticizer and the polyester stitching and even the sailcloth.****DO NOT***** use this method on Mylar or other High tech sail cloth materials. DO NOT use method on colored/dyed dacron ailcloth ... this cleaning method is for WHITE dacron ONLY. ;-)