http://www.autopia-carcare.com/autopia/tps-clay-f80y.htmlThat stuff is supposed to be pretty good. For a lubricant, you can just fill an empty spray bottle w/ water and then put a couple drops of your car wash soap in. I wouldn't use stuff from a hobby store on my car, for the same reason I wouldn't use floor wax on the car

DavidB, the owner of the site, is working on a nifty foam clay holder.. Similar
to this, but with a cutout in the bottom to hold the clay.. he's gunna somehow make it hold lubricant too. Should be pretty cool.