I have a medium sized pipe, that i scrapped..but i have a little bit of resin inside the bowl part at the very top.
I cant get to it with a scraping tool (paper clip or anything)
and ive tried boiling it, but the resin doesnt seem to want to come out.....
Try using warm rubbing alcohol. I put it in tupperware in the microwave for 30 sec or until it boils then pour the alchohol in a plastic baggie with the bowl and swish it around. I repeat it again and my bowl is spotless. No scraping, I've broken too many bowls that way!