powerwasher marked vinyl siding

otto alber

New Member
Dear fellow powerwashers, my question is as follows: I recently powerwashed vinyl siding on a pretty hot day, using ZEP all purpose cleaner on a 1:8 ratio. Most of the siding looks great except for the south side which shows some swirls caused by the ZEP or the powerjet. I am really not sure . Is there anyway to remove these swirls? I tied powerwashing it a second time just with water. Not much improvement. Thanks for your input. Otto Alber * New Hope Window Cleaning Service
 

Mark

Moderator / Sponsor
Assuming that the siding is oxidized, (oxidization should come off by rubbing)
I would wash that wall with a strong soap solution and brush to remove oxidation.
 

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