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Detailing question - best way to spot swirling?
So I'm going to have my new F30 treated with Gtechniq CS once delivered. The detailer I've engaged has told me to ask the dealers to not clean the car. I've passed this on but I don't trust them - what's the easiest way of spotting swirling? What, if anything, should I take along to pickup and what should I look for?
Appreciate it's probably bloody obvious (big round swirls, you numpty) but just want to make sure I spot anything before I drive off!
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