How about a strong solution or warm water and Dawn dishwashing liquid? If it takes crude oil off baby ducks without killing them, a greasy vacuum advance shouldn't be much of a problem. Ditto for Tide or one of the other heavy duty laundry detergents!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!