I try to keep the pipes inside clean as much as possible as I think a clean fresh pipe delivers a better smoke than one with residue from prior smoke, at least this is my feeling. For this in addition to cleaning the pipes with running warm/hot water as described in other threads, after they are dry I put a cleaner in the stem and some paper tissue in the bowl with the idea to absorb some odor and as a matter of fact when I use the pipe days or weeks later the cleaners and tissue have smell so I think they taking away some of it. Anyone does this or is it too excessive?