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BenP said:When you think it's too dirty for a QD spray and MF to cope with the amount of dirt on your car and not inflict swirls. If there's any doubt in your mind I'd say it's safer to wash.
Personally I rarely use a QD to actually clean my car. If I've only driven a few miles and it's been dry then yes I will, but most of the time I'll wash (two bucket method) just to be safe. I don't find it takes a great deal longer either.
Ben