The best way I have always used to scrape without the need for alcohol or anything, is to take a few dry hits, to heat the bowl up nice and warm.
Then take a bobby pin or scraper, and get in the areas where resin builds up, corners and crevices like the lining of the bowl, and the walls around the stemp. Don't worry about pulling any out at this point, just mix it around aggressively.
Then take the bowl upside down mouth peice down, and tap it with the palm of your hand. Hard enough to make gravity knock chunks of resin out but don't smash your piece on your palm.
Repeat this process, because it may not start working until the resin cools off. Re-heat occasionally finding the right temperatures and places with built up resin is the key.