I have never noticed a change in the appearance of the paint after using clay; however, I could always feel a huge difference. I sleep comfortably knowing that contaminants aren't eating at my paint.
claying also cuts down on swirling...lifts teeny tiny road sediments that grab onto your paint that don't come off in the washing process (unless you for some reason rub real hard when you wash). Those who don't clay then unwittingly rub these sediments all over the paint when they buff and wax(which does break lose the particles)...voila new swirls.
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GT3 Recaro Seats - Boxster Red
GT3 Aero / Carrera 18" 5 spoke / Potenza RE-11
Fabspeed Headers & Noise Maker
BORN: March 2000 - FINLAND
IMS#1 REPLACED: April 2010 - NEW JERSEY -- LNE DUAL ROW
Allot of people wash with Dawn before claying and polishing. Its a very concentrated detergent when compared to car wash soaps made for frequent use, afterall Dawn is made to remove dried BBQ sauce from your dishes. Doubt you'd get that off the plates with most car wash soaps. But there are car wash soaps that strip the paint bare too like P21S paintwork cleanser.
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GT3 Recaro Seats - Boxster Red
GT3 Aero / Carrera 18" 5 spoke / Potenza RE-11
Fabspeed Headers & Noise Maker
BORN: March 2000 - FINLAND
IMS#1 REPLACED: April 2010 - NEW JERSEY -- LNE DUAL ROW
I am not a professional detailer or stay at Holiday Inn Express
I was "told" that if you don't strip the wax first, you are only removing sediment/bugs/grime/fallout from the "layer" you are scraping (which would be the wax buildup)
I am not suggesting that you don't take care of your car or paint (possible the present paint is as "clean" as its ever going to get)...but if you (or someone) are (is) already waxing over an accumulation of "crap"...you may not be removing said substances with the claybar process.