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Originally Posted by Dr. Kill
So is that "fourth grade" that we common people buy the most mild or most aggressive of the four? Or are you saying it depends on which of the manufacturers it comes from?
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Hi,
With 1 being the most agressive and 3 being the mildest, consumer clays are about a 2.5. Agressive enough for general purpose (surface cleaning, overspray, sap, rail dust, brake dust removal) use, but mild enough to keep the consumer out of trouble. Pros don't use it because they're trained to use each grade properly, and for it's intended purpose. The consumer on the other hand doesn't want 3 different grades on hand, it's more economical to have an all-purpose clay. But, again, it's all about clean clay, light pressure, and plenty of lubrication...
Happy Motoring!... Jim'99