I know many guys are doing the "new?" hot water cleaning thing with great success. i just stick with Everclear, pipe cleaners and paper towels. I've never noticed any alcohol leftovers taste. I tend to think alcohol (Everclear) evaporates pretty quick. In past years I used 151 Rum and ever noticed anything odd. And it's primarily the stems that gather all the funk and junk.
I've never clean my pipe right after my smoke. I ruins my enjoyment of the smoke. I dump/scrape out the dottle and set it aside.