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OP, you did the right thing. Gut feeling aside, You'd be surprised what people do at car washes. My dad and Uncle used to own a couple. One time at around 7 PM my dad was emptying quarters out of one of the vacs. 4 guys pulled up in a Mercedes and started waling toward him. One of them yelled to give up the money. Luckily, my uncle walked around the corner at that moment and they took off. After that, he never went to one without a gun (illegally). Now, he wants to get his CHL. People do all kinds of crazy things at places like that. I've found drugs, knives, and even shotgun shells there. Always be aware of your surroundings.