I also tell them to just use some gun oil, like Tru-Oil or even some good furniture polish. I tell them to use a Q-tip and do the inside also. I don't tell them to use listerine, as I have never heard of doing so, have never done it, and don't see the reason. My spit hasn't killed me yet, and don't see the need to disinfect my own calls. ;D But that's just old dirty mouth me. ;D