I did this same thing a few years back (also to a Weaver GP38-2) and had the exact problem with the alcohol. Someone else answered with Easy Off Oven Cleaner (bought at HD or similar places). Here is the thread: Stripping, Detailing, & Repainting Project (Weaver GP38-2) On page two is where the Easy Off is mentioned. I was afraid to use it at first, but it definitely worked and have used it multiple times for other train projects since.
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