+1 on gun scrubber polymer safe. it's good stuff... just make sure to use it in a well ventilated area. i accidentally got really high because i didnt realize the wind was pushing all the fumes right back in the window.
Break Free Powder Blast is pretty good as well, but to my knowledge, they dont have a polymer safe version yet.
Break Free Powder Blast is pretty good as well, but to my knowledge, they dont have a polymer safe version yet.