What to use to clean a TPO roof

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I have a TPO roofover on a mobile home. What is the best way to clean it and what do you use?
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I use a small Ryobi pressure washer. I think it is a 1700 cfm. Not the smallest one, but the next size up. Got it cheap on sale. Plenty strong enough. Easy to pack around. I use just water, no soap. If you had a bad mildew area, you could spray it with Simple Green from a bug sprayer, or douse the area with Spi-n-Span, let it sit a few minutes, scrub if necessary, then rinse with the pressure washer. I have cleaned 20 yr old single ply roofs, with zero damage.

Today is PERFECT!

All information and advice given is for entertainment and informational purposes only. The person doing the work is solely responsible to insure that their work complies with their local building code and OSHA safety regulations.
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