Better for glass pipes is a mixture of rubbing alcohol (the higher percentage the better) and salt. You want the salt to form a paste so not too much rubbing alcohol. Then you shake the shit out of your pipe for about 3-5 minutes then rinse out the alcohol and salt with some warm water. Et voila you have a shiny clean pipe. Sometimes you might need to do a second scrubbing to get anything left over but usually the first go is good enough. After that I hit the whole thing with bleach just so nothing funky grows in the water and then one more rinse and my dab rig looks brand new.