You just have to watch what clay you use. There is a huge difference between fine-grade and heavy-grade clay.

I would use a DA for beginning and then slowly work your way into a nice, lightweight, quiet rotary. If you enjoy it as much as I do, then you should spend some decent pennies on one. Once you get good you can always charge your buddies like $30-50 to do their cars.

My favorite is interior cleaning though. What products do you guys run on your interior? (carpet, vinyl, leather, rubber, plastic, trim, glass?)