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With the new clear coat finishes, it is not a good idea to use dishwashing soap, instead use a quality car washing soap that does not contain any silicones (Zipwax). Believe it or not dishwashing soap is stronger than carwash soap.
Also you should not use a sponge, instead use a wet towel or wash mitt, rinsing often. And finally on a clear coat finish do not wash with circular motion, instead use back and forth strokes.
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