Use only non-linting materials to clean the striker or firing pin channel in actually any weapon. Lint can cause light strikes by itself, and with dirt, it can really muck things up. Coffee filters or Chem-X filters are non-woven materials which will clean well and not leave fibers behind. Cut the filters into strips and you can use them in cleaning rod patch holders, or on the end of plastic straws to clean channels, rails and the other spots you need a good cleaning matrix to reach. I recommend that you use mineral spirits to clean, it won't hurt polymer, at least over reasonable time periods. I left my Steyr pistol lower in for 24 hours without a noticable change in color, flexibility, or stiffness. Twenty minutes is plenty of time to competely loosen powder residue. For those of you interested, I use Ed's Red for my rifles and shotgun. The recipe can be found on www.frfrogspad.com. I use the version with mineral spirits, ATF, kerosene, and acetone. Use it only on metals. A blend of 50/50 ATF and kerosene makes an excellent lube for those who like wet lubes.