Sadly Gregg has passed away
Challenge lives in a pretty much dust free garage and only picks up a bit of frontal road grime when in operation during the warm months. He is cleaned immediately after each use. So, I'm not so sure that the clay bar treatment is necessary this spring. When observed under sharply oblique lighting, no hairline scratches appear and the paint is glass smooth. In the past I have used the clay bar religiously each spring. Any adverse effects from too much of a good thing? Your advice please?