I usually shake mine upside down a bit to get all the chip crumbs out, followed up by a good vacuumming with a brush attachment. Finally a good wet wipe down with a rag and a cleaner that is safe for the plastic and test (simple green, diluted alcohol, etc).
Works for DOS and Windows PC, too.
Have fun
Wheels within wheels / In a spiral array
A pattern so grand / And complex
Time after time / We lose sight of the way
Our causes can't see / Their effects.