"If this is true, can the xylene/toluene be substituted with acetone or would it make any difference? What about using V&MP Naptha?"
no, acetone isnt a nonpolar solvant, but acetone washes wouldent be a bad idea, check TFSE for techniques and stuff.
Naptha is indeed a nonpolar solvant, and may work as a substitute against certain gakks, however xylene and toluene are more aggressive so they would probably work better....