In my humble, it created a bitterness (the 90% isopropyl, that is) that lingered in the stem for a while (as in, half a bowl-full) after I supercleaned a pipe. To test this theory, I used it on an already-clean pipe. Dried for a day. Same thing. Apparently my tongue isn't into it.
Some don't detect any residue, some do, it seems. Try it out, if you don't like it, you have a great disinfectant and antiseptic wash for cuts and scrapes. 8) I prefer ethanol alcohols for my pipes. The littlest bottle of Everclear will go a LONG way, but yeah, it's pricey by comparison.