NO ACETONE !!
It's a strong solvent for lacquer - one touch and you're gone.
Water/detergent can work well, but if there are any voids or cracks in the finish the water can cause grain raising and be generally troublesome.
I use mineral spirits or kerosene for nitrocellulose sanding. Interestingly, you can use those solvents for "wet" sanding with regular open-coat sandpaper. So, if I feel the need to get really agro on the finish, I'll start with 400 grit or 600 grit open coat, and follow with the finer grits of waterproof - up to 2000, as needed.
It's super important not to scrub around and around with the sanding, but to be sure to clean the surface off as you go, so you don't grind in particles you've just sanded off the surface. That's what the lubrication is all about. . .
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Cheers,
Frank Ford
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