once about every 5,000-10,000 rds. is recommended to get the built-up lead out, or eventually the suppressor will become non-functional from being clogged up--it's why i bought a tac67 with the removable end-caps, i just removed it after the first 1,500 rds. to check and the build-up was impressive--the baffles had to be hammered out with a wooden dowel to break them free from the crud, i think i won't be waiting for 5,000 rds.--as far as one that can't be disassembled you need to soak it in something that dissolves lead fouling but of course not your suppressor materials, someone else may know for sure