I don't know how popular Vapor rigs are here, but I have become attracted to them lately due to the potency of extracts, making medicating easier, requiring no plant material to be burned and a very small amount to be smoked.
But when using one, they get dirty quickly, probably due of how resinous concentrate smoke is. But with nothing being burned other than pure thc I always thought it a waste to throw away the solution. So I now clean my Vapor rig out (99% ISO), and double-broil the solution down until the ISO is all evaporated. The finished reclaimed oil (reclaim) is dark, and doesn't taste great, some people smoke it, but with taste involved, I avoid it.
But making THC butter out of it is amazingly simple. Double-broil butter till melted, mix in reclaim, stir for 10, let cool and bake. No bad taste at all, can barely tell they are canna infused, and .1 is a good dose.
You're left with a clean rig to use, and a batch of cookies that medicate well, taste good, and no wasted product. Some people are a little turned off by the reclaim process, but the end result is an amazing edible. What I use to throw away makes edibles for 2 weeks.