The biodegradable Star Brite Sail & Canvas Cleaner formula safely cleans and brightens all types of white and colored sails/fabrics. Star Brite Sail & Canvas Cleaner Features: Concentrated formulaCleans and brightens whites and colorsBiodegradable, safe and easy to useRemoves mildew, dirt, and grease stains from canvas, sails, and fabricsWill not weaken fabric or threadGreat for boat covers, sails, and bimini topsAlso cleans nylon or dacron sails