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uhm, i personally would never wash any of my vehicles in any other fashion besides by hand. I haven't seen/visited a carwash in years, so idk what kind of new stuff they have going on, but i'll pass on that.
Matte finishes need to be washed lightly and delicately. Overwashing, and scrubbing at the paint can cause irregularities in the finish (turning it shiny)
That is coming directly from my PPG manual.
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