[rwcw]

Quite some time ago, there was a thread here on Talk of the Villages about the pros and cons of power washing one's vinyl and some one suggested what turned out to be a better way for me. No water under the vinyl causing rot and no chance of damage from the high pressure washing.
What someone recommended and what I tried was to mix a solution of one third bleach to two thirds water. Spray it onto wet vinyl and let it sit for a few minutes. Rinse it off with your hose and your vinyl will be as bright and clean as it was the day the contractor put it up. The sprayer is one of those garden sprayers people use for insecticides or other garden sprays. One or two gallon pump type sprayers. I had green algae on the north side of my house and it took it right off.