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Another good car wash trick, although slightly more obvious, works at the manual car wash. The kind where you insert coins/tokens and wash the car yourself.
All you do on this one is get a speaker (or any other large magnet) and hold it up where you put the change in. Tap it on the machine and it will give you 1 credit. Just tap away and you get your free car wash.
Although for some reason or another this won't work at some car washes.
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