All I can do is laugh. I know you intend well, but you really don't know what you're talking about, no offense.
I take digital images of all my slabbed coins for my photo inventory. Among other things I need the slab as scratch-free as reasonably possible. Here's a recent purchase that I forgot to clean up first: http://www.cointalk.com/t121920/ The problem is most noticeable at the top of Liberty's head. I use the Novus polishes. The polish for "Fine Scratches" will take care of >95% of problems. The polish for "Heavy Scratches" will take care of most of the rest. Since I haven't tried any other polishes I can't make a comparison.