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Although I use Clenzoil, I have tested it on wood and it, not surprisingly, leaves a oily discoloration. Maybe this will disappear in time, but I am a little reluctant to put Clenzoil on wooden grips. Also, although the Clenzoil advertising hype says how wonderful it is for metal, wood, and leather, it is strangely silent on whether or not it can be used on plastic or bakelite. Since it appears to have a petroleum base, I could see it eventually softening Black Widow or other plastic grips if the grips are exposed to the Clenzoil for a while. I wrote Clenzoil once asking about this potential problem, but they never responded.