if you use any method listed so far no you won't be able to smoke the left over resin... i usually just leave htat resin there (well back when i didn't use the boiling method) i like dirty pipes, the only reason i celaned 'em was to smoke resin (i like dirty pipes cuz it gives the pipe character and really brings out the colors and patterns...)

btw if you use any cleaner you definately won't be able to smoke it...

you could let the pipe soak in pure alcohol for awhile, shake it, and soak some more til all the resin is out, and just pour the liquid in a shallow wide container (A bowl for instance) and let the alcohol evaporate naturally, then you'll be able to scrape up the resin and smoke it....