I wouldn't use a carwash if I were you... but... for different reasons.
The problem with automatic car washes is that little fine fragments of grit off everyone's cars can get stuck on the whizzy cleaning things and end up putting nice fine scratches all over your car.
High presure jet washes are better, but only as long as you're careful to use them correctly. For example, don't be tempted to go too close to your car to blast a bit of dirt off, or you'll end up striping your stripes off as someone on here once found out.
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