Really don’t recommend power washing vinyl. You will drive to much water up behind the siding. Buy the gallon containers of house wash at the hardware store and spray out of pump up weed sprayer. Start at the bottom and work up. Rinsing a section at a time. Added help keep a five gallon bucket of water and dawn dishsoap and a brush with an extending handle to reach more area. (Like the window washing handle at the depot) I spray the house cleaner on, let it sit a few mins, in heavy dirt or mildew areas brush the dawn mixture on and then just hose it off trying to keep the water stream pointing downward. Just wear old clothes. The deck wash with ruin them. Eye protection and mask advisable.
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