My first post. I have a real old circa 1992 Celestron G11, I do annual clutch cleaning but I have not done much to the four bearings on RA & DEC axis and they are in need of cleaning and re-lube. My question; for removing the old grease is WD-40 the right solvent? I have White Lithium Grease for lubrication after clean up. Appreciate any other tips in connection to this basic maintenance issue. . Vahe