I had someone contact me about washing off their building. Siding is made of sheet metal. The dirt is mainly cob webs and ordinary dirt. I’ve never done this before, and my question is, what method and detergent works best for this type of surface.
If just dust, dirt, and spider webs then just use your house mix minus the SH.
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House wash mix and a lot of rinsing will clean it up quick
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