I have seen my neighbor doing the same as above with good results. As I stated, mine does not seem to show tire marks. Also, if I did not mention it, our lanai is painted, and while I was using the high pressure cleaner, some of the paint actually started to come up! This is less then 2 years old..... I will be calling home warranty to ask about the situation.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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