I use a leaf blower, $60 model from Toro called Super Blower. This was mentioned in the past as probably the best way to blow off excess water from the wheel and brake area so that rusty color water doesn't drip onto the inside of the rim. Of course it works perfectly and quickly for the rest of the car also as the jet stream is extremely powerful. YMMV but one try with this and you might not use any other method again. Blow, then touch up with a dry towel and there won't be one spot on your car once the job is done.

I wrap the tip with some duct tape so that even if I touch the car with it, no harm is done.

Only issue is neighbors might look at you funny, going at your car with a leaf blower. Just don't do it early Sunday morning and things should be cool.

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