Here's my take on this "cleaning" process, screw the resin.. try "oxy-clean" or "sun oxygen cleaner" or similar "oxy-clean" type powder. If you use boiling water and pour it on your bowl with a little amnount of this stuff sprinkled on it (not too much)... you will be amazed.

It bubbles for about 20 min and if you do it twice, every nook and cranny should be clear. Unless you are tryikng to scrape and save your resin, try it!