Heated sonic steeping is a fairly high cost dark art with as far as I can tell questionable results quality wise. The people who claim success with sonic steeping do not use standard sonic cleaners. They use fairly expensive industrial models and those models are powerful enough to cause heat all on their own.
More than a few people claim no significant effect even when using this expensive gear.
If you’re only three weeks in I personally would suggest a far more basic start. It’s faster, cheaper, and possibly just as effective.