I used sound on a fairly new machine. And all I can say is don't use it unless your paint is running and hasn't seen much maintenance/detailing/cleaning after a while and you're parking your car outside or there was dirt you want to get rid of more aggressively. There was virtually no dirt or other particles picked up by the clay (I used it on a car roof). Because the clay leaves micro-scratches on the paintwork and doesn't clean it any better than other methods, I wouldn't use it again on this particular car. Maybe the audio is too fine for a good job, IDK. I would rather use DA polishing paste and a deep cleaning paste.
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