what i do is just boil a pot of water, then put the pipe in once it boiling. i leave it in for 15-45 minutes. (i usually do 45, gets everything). then remove pot from flame. put pan in sink under the facet. put the hole u hit it from on the pipe under the stream of water and draining into the pot for like 5-9 seconds, (dont need a heavy stream of water, jsut small.) now, just slowly drain the pot, into a coffe filter ontop of your drain.the water will go through and you will get a thing of resin on the coffe filter. scraping after doing this isa good idea too. jus a quick scrap tho.