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and don't wash it in the sun, or when the paintwork is particularly warm.
Always better to do it yourself, even if you have to wash it on the road. Personally, I've seen those handwash chaps at Sainsbury's drop their sponges, then without even rinsing (though it's preferable to change it), pick them up and start shampooing a vehicle.
As for automated car washes, you'll get lots of nice swirls (at the very least). So they're no good either.
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