if you have a cracked distributor cap then water would get inside it and make your car stall.
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Let your kids do it. Wait for the cheerleaders to have a fund raising car wash.
Stronger than you my friend.
2 car-wash
Assuming the question is about speeds, there is no simple answer. For example, a speed that is safe for a car on a winding road in wet weather would not be safe for an aircraft - the aircraft would probably stall!
If the runoff from a car wash is not captured, many pollutants (petroleum, brake dust, etc) from a vehicle can be washed into storm drains or seeped into ground water.