Once you learn how well a clay bar works, it's a tempting tool to use. If it makes paint feel brand-new, why not just use it everywhere? That's because some surfaces don't get cleaner when clayed — ...

There’s a lot of gross, nasty stuff on the road. We’re not just talking about poorly modified Jeeps and de-catted Mustangs here, either. The road is a dirty place, and that’s obviously why your car ...