not a mothers clay bar, but i have used a clay bar. I don't think it would use it to get swirl marks out of the clear coat, there are several polishes that will help with that, even a cheap orbital buffer will do the trick. A clay bar is used, or at least I use it for deeper scratches in the clear coat, paint blemishes, or scuff marks to the paint. I bought a cheap small 5" orbital buffer for $30, every once and a while, after a bad rainfall or something where the bike really got dirty, I will pull that out with some final polish and it does wonders and removes all the surface swirl marks. Last bike was black, this bikes color isn't so obvious.