Man you seem to find some interesting stuff to put into your firearms. I have never heard of GOOP used as a gun cleaner.
Just a healthy dose of Hoppe's #9 and a brass brush or even some of that Gun Scrubber if you want to use an aerosol will remove most or all of the accumulated stuff.
Follow up with a little (emphasize little) amount of a good quality gun oil like Hoppes. I use a Q tip to lube the exposed contact surfaces in my guns.
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