Here's how I "reclaim" my pipe residue... I usually do this for a really fogged up stem, but also when the puddle is down to that last little ribbon of dope that just doesn't want to roll around and smoke properly. In a cabinet I keep a clear glass plate that's about the size of a large saucer, like 8 inches across. This needs to be actually glass, not ceramic or porcelain. I have this plate tilted very slightly with a folded up rag unter one side. Next, I have a small desk fan that stays pointed at the plate.
Whenever I feel like it's time to reclaim the buildup in my pipe I cover the hole on the bowl then tip just a little bit of distilled water down the stem. It doesn't take much at all. Then use another finger to close the stem end and shake the bowl. Don't go crazy since it's only your fingers keeping the holes closed. Now, go to your cabinet or closet or wherever you have the plate and fan. Dump out the water in the lower side if the tilted plate, so it naturally collects there. Turn your fan in low and the forget about it for a while.
It'll take a while, with several rinses to build up any sort of usable amount on the plate, but it will certainly be usable! Use a knife of some kind that will fit the contour of the plate and scrape it off. I DO NOT recommend trying to smoke this. What unusual do is put it into capsules and eat them.
I know that's kinda elaborate, so you always just add a tiny bit of water to the bowl then shake it up and drink 3.