After blowing off all dust wipe down with a tac cloth then use a solvent cleaner designed just for that purpose and available at any auto paint store. If you want, a last minute once-over with a tac cloth wouldn't hurt for primer but is definitely best just prior to finish painting. [/quote]

Is that solvent cleaner the "wax and grease remover". Or is there some other type of prep?

A day without laughter is a day wasted- Charlie Chaplin
When wrestling a grizzly bear, you have to keep at it until the bear gets tired, not when you get tired.
1948 Chevy 2-Ton