Hose down the siding.
How to use simple green siding cleaner.
Rinse at high pressure keeping the nozzle at least 2 feet from the surface and the spray perpendicular to the surface.
Clean in sections using a soft bristle brush.
In a clean bucket add 2 cups of simple.
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The oxygen bleach will clean the vinyl.
Dilute 1 measure of simple green with 10 measures of ambient water example.
Rinse with a garden hose at highest.
In a bucket or large container mix 1 5 cups simple green oxy solve house and siding cleaner in a gallon of water.
Use a soft bristle brush to apply the cleaning mixture in sections scrubbing firmly enough to clean without damaging.
Allow cleaner to dwell on surface for 3 5 minutes.
Never spray upwards under siding.
Allow the cleaning solution to remain on the surface for several minutes but not to dry.