My philosophy for cleaning a car is based on the Hippocratic oath and the furniture restorers creed: Do no harm and use the mildest method and chemicals to get the desired results.
I would never bring a power washer within 100 feet of my car. Why? These cars are electronic monsters. Yes, BMW uses great connectors (BMW actually bought a German connector maker years ago so that it could control the quality of its connectors). But, BMW, like most car makers, has reduced the weather protection in its cars to reduce the cars' weight.
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