No matter how hard you scrub, sometimes you just can’t get that last stubborn ring of grime off the inside of your slow cooker. It’s called a “hard water stain”. Dish soap and elbow grease often aren’t enough and your dishwasher doesn’t seem to make a difference.
Thankfully, there’s a product out there that is perfectly safe on your porcelain crock and makes cleaning that stain deceptively simple. It’s called Bar Keepers Friend. Sprinkle it on, scrub the stain with the rough side of a moist sponge, then rinse it off. It also works on tile, glass, plastic tupperware, brass, copper, and stainless steel, so you’ll get plenty of use out of it beyond just your slow cooker.
If, however, you’re looking for a solution (pun intended) that doesn’t involve leaving the house, I’ve got even better news. First, fill your crock pot to about half way up the stain with water, then use vinegar to fill it to just above the stain. Let it sit for a few minutes, then give it some elbow grease. Should come right off.