Forgot to mention this, couple weeks ago I was at Lowe's and in the power wash section they had a cleaner called 30 second cleaner, white bottle, attach to garden hose, get siding wet, then turn valve to soap, spray lightly and then in 30-50 seconds, use a brush gently, it worked like gang busters on my siding. no streaks and clean as a like new. Try it on the RV.
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