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I used to use one. But after driving in a hard rain, the radiator fan on my old MB E320 came on and stayed on and the engine started running like crap when it was cold. The dealer found water in a sensor connection, which told the computer the engine was hot. It cost me $100 to have them dry it out. After that I decided I'd rather let it be dirty than risk having something like that happen from a pressure washer.
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