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Sorry it took 10 months, but here is the PWI sticker on one of our box trucks.

I have a customer who told me that the white is from using a harsh ice salt this winter. After using search and reading a lot on these stains, what do you guys think this is? Salt that can be PWed off, Effloressence, Calcite, White scum, etc...?? I have a product similar to Safe restore...