cleaning your bowl
Ok so im lazy and have used my bowls many times without washing them very well. And as of now the rims of all my bowls are incased with a hard black coating that will not come off. I have used scratch pads and soked them but nothing seem to be working the only way so far i have been able to get the gunk off is to scrape it with a sharp knife. So ive learned my leason but i still need to get them clean now so i can keep them clean. any suggestions its been very slow going scraping them with a knife any ideas would be apreciated.