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So I've got this Sigma UC 70-210mm AF zoom lens and it's in great shape except the rubber grip has this sticky residue on it. It's not dirty but it just feels yucky like a three-year-old kid has been handling the lens after eating a peanut butter and jelly sandwich. I think the rubber is actually beginning to deteriorate. Is there any way to clean it off? I tried using an alcohol prep pad, since isopropyl alcohol is a reasonably good solvent that evaporates quickly and leaves no residue but that didn't seem to touch it. I really don't want to use anything that might work its way inside the lens and gum up the works. Suggestions are greatly appreciated.