Was the colour of the 'crud' the same as the paintwork? Clay consists of tiny mineral particles which are abrasive. A similar result would probably be obtained by using T-cut or Brasso. I would never use an abrasive on a car's paintwork which these days has a thin topcoat of lacquer, which, as it is only a few microns thick, you have probably removed. It'll certainly look good after a coat of wax, but not for long.
I only ever use rainwater to clean our cars, and have just waxed Mrs F's 6yr old Peugeot for the first time. Very occasionally a dab of WD40 for those pesky tar spots.
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Clay bars new
Clay bars new
