The Auto Wash Bowl Chicago - 1924. Roads were mostly dirt back then and so the undercarriage of the autos would get pretty dirty. One solution tried in the mid-west (such as the Chicago "Auto Wash Bowl") was a flooded circular basin where the cars were driven round and round before getting more detailed topside washes by hand.
How to Properly Wash and Dry a Car - I just came upon this site and it's the best info i've found so far that's directly aimed at avoiding the fine scratches or spider-webbing that can eventually appear on dark cars..esp black!
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