I might be pushing my luck, but I've used Goo Gone on leathers and never had a problem with discoloration. I don't apply the Goo Gone directly to the leather though, I put it on the cleaning rag first and go from there. Doesnt take much to get rid of the bugs. A quick wipe and then maybe a little scrape with a fingernal and then wipe with the rag again and good as new.
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