If you have ever used a slow cooker, you know that the burnt remnants can be a pain to scrub off completely. Here's a simple cleaning tip: keeping the slow cooker going and adding water will make it much easier.
Photo by Joelk75
The Kitchn's trick is to empty out what you made into a new pot, fill the slow cooker with water and just let it keep cooking.
Make sure the water level is high enough to cover any burnt-on rings. Set the cooker to LOW and let it keep going for a couple of hours. That stubborn, cooked-on residue should come off much easier after this treatment.
If you want to give it a thorough cleaning, the good old trick of bicarb soda and peroxide should work wonders.
Clean the Slow Cooker by Keeping It Turned On [The Kitchn]