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Originally Posted by tom hyle
strong alcohol is often good to try; it's real cheap, so an overnight bath in it is not expensive to try, if you have a long tray or cylinder of some kind. Never heard of it hurting a blade. It's great if you want to strip down black or brown hardened-down-oil patina, or some Irian Jayan paint; great cheap solvent. 90%+ isopropyl is usually available.
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Isopropanol will not hurt a blade, there is 1n-butylnol, methanol and ethanol, all are alcohol solvents that have different "cutting" properties and will not hurt a blade. All of these alcohols are toxic to some degree (keep off the ethanol, mama always said it was bad).
Sorry, I not knowledgeable enough in this area to recommend to best.