Personally, I like waterbased Wax and Grease remover, I know that Valspar makes one, not sure about others. If you use any kind of commercial ready wipe or such, be VERY carefull to read the contents to insure there are no oils or other things that would contaminate it. On dope, using a solvent based wax and grease remover should be ok, just be sure to allow enough time for the solvents to completely evaporate from the basecoats. Laquer tends to be very absorbent with most any solvents. I have also heard of some using windex and lots of clean towels (lint free). In any case, clean it with lots of liquid, more than once, in other words, if you think you have it clean great ,, clean it once more,, lol,, kinda like sanding, do it till its perfect, then do it some more,,