From my manufacturer: 1/3 cup detergent (Tide for example), 1 quart 5% Sodium Hypochlorite (Clorox for example), 3 quarts water, 2/3 cupTrisodium Phosphate (Soilax for example). There are a # of 'Vinyl Siding Washes' on the market now although I have not heard of their effectiveness. Mine cleans up good with just a good pressure washing.(H2O)
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