Actually, Iscrub mine to the bare raw metal after every use with steaming hot soapy water including a couple dozen strokes with a bore brush, and a hot water rinse to prevent any buildup whatsoever...still use NL1000 as the bore lube...Iplaster it in there over every square inch of surface area...my MK85 had laid in it's case for a few years that way before I sold it and it still looked like new.