Haha, these are my favorite threads on here. I starting water flushing when it came up in the forum a few years back....$100 pipes to $5k pipes. New pipes to 19th century pipes. Zero damage, zero issue, to me a better holistic result than pipe cleaner/alcohol (what I used prior). Don't want to do it? Don't. I think the 'biggest' factor on cleaning your pipe is giving it the once-over prior to all the funk n' gunk cooling and hardening. Water flush, for me, takes it an extra mile in odor and mortisse TLC.