I use 151 proof rum for deep cleans. After every smoke, I simply corkscrew a paper towel into the chamber and run a pipe cleaner through the shank.
As many other said: I just run a pipe cleaner through the stem and shank after each smoke, then bend the same pipe cleaner and use it to swab out the inside of the bowl.
For estaes or ghost issues is better a more deep cleaning with alcohol or dedicated pipe cleaning solutions. I'm not a fan of the salt and alcohol treatment, in my experience using just the alochol works fine.
I heard of so many crazy and dangerous methods that can not believe someone would treat his beloved pipes that way!
But anyway, there are so many different tastes...
I avoid deep cleaning my pipes by swabbing the bowl and shank with Everclear on pipe cleaners after every smoke and ream if needed. Why let every bowl you smoke get gradually funkier and funkier until you can't handle it anymore and need a deep clean?
As do I. Hot water rinse does OK, but not quite 100% of where I want a pipe to be before I smoke it again. But this is another hardy perennial topic, lots of opinions.I disassemble them after each smoke and clean them. No need for deep cleaning.
Look up the threads on water cleansing. Been doing it now for around 1 1/2 years. I rarely, if ever, have to deep clean now. Also helps keep the rims clean.