I know another gent who has been known to put his pipes in a sink full of soapy water to clean them. I have used soap and water and a toothbrush to scrub nasty rusticated estates keeping the bowl down to keep the chamber as dry as possible. Never any problems.What happened to the pipes?? Only the dry cycle would potentially cause real damage. I often use hot water to rinse bowl and stem, best way to remove all ash and soften and crud in the stem to be removed by a pipe cleaner run through. Heresy? Perhaps, but it works for me.
My "hanging" offense might be that I use one pipe per day and smoke 10-12 bowls in it. I have also knocked my pipes against the sole of my shoe. Any fecal matter picked up doing that is subjected to the heat of my Zippo so I don't worry about it.