John,
I`ve always found good car wash soap to work well for claying. However, Poorboys point is well taken. If a product can lubricate better, than it would be safer to use with a clay bar. I`ve gone as far as to examine the paint finish while claying with a Jewler`s lupe. Surpisingly, the clay "files down" particles, as much as is lifts them. It also leaves micro scratches that can be tough to see, unless done improperly, and then the scratches are easier to see.
Like you, I`m sketical about these things, but willing to try something that might work better.
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