1buckie: I spent literally all Dat cleaning both. I haven't cleaned my 22 ever. I used a stainless brush on my drill and I'm still not 100% happy, but they are both worlds better.
Andrew, I'd be kinda careful going at it with wire in a drill.....possible you could scratch into the porcelain, buddy.....not really criticizing, just hate to see it scratch & that might happen.....
If it gets hard & crusty enough, maybe resort to oven cleaner or the old standby, razor scraper....
Folks have used these guys to great effect......the blade will bow slightly & curve with the bowl & take up all but the very toughest stuff......