I am not really sure of the deal here, BUT I do have suede/nubuck type boots (and have a black pair of jungles just to satisfy my spit shining needs) so here I go off on a tangent.
The next time you go out to the drugh store (Rite Aid, Walgreens, CVS, Genovese, Duane Reade) or supermarket (A and P, Pathmark, Walbaums, Shop rite, etc. etc.) or super store (Kmart and Walmart) go into the shoe car section and loom for Kiwi's suede and nubuck cleaner and they also have a protectant. They also have this nail brush and eraser in a package.
It may or may not work, but if you try a small spot and like it, why not?
Hope this helps,
Jason