not on firearms (and I don't think I woiuld), but I have also dipped a few vw fuseboxes in coke to clean up the tarnished contacts. (not for too long, they were then cleaned with soapy water and rinsed in clean water, etc.) it worked well on the plastic ones but I experimented on a spare rough Bakelite? fusebox and the Bakelite didn't react well.
I have also used coke to clean concrete with reasonable success. proper concrete cleaning chemicals would probably have worked better but I had been offered a couple of cases of date expired coke to try.Information
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