See if you can scrape off a small amount of the brown stuff and put it in an old spoon or something and slowly heat it. Most epoxies begin to soften and break down at around 160 degrees or so. If the residue does not become soft and sticky, it probably is corrosion which needs to be neutralized somehow.

Voting for anti-gun Democrats is dumber than giving treats to a dog that shits on a Persian Rug