FIREClean™ is a fouling-resistant oil that is biodegradable, and non-toxic. FIREClean™ cleans and lubricates suppressed short-barreled AR-15s, inherently dirty guns; 22LR, autoloading shotguns, muzzleloaders, and even blowback submachine guns. Professionally tested at high volume rental ranges, retired military personnel, private gun instructors - all have endorsed FIREClean.
Suppressed M&P22 with thousands of rounds- wiped off with paper towels.
FIREClean and #0000 steel wool can do wonders to remove rust.