This is the garbage disposal splash guard. Slime & gunk will accumulate on the underside of the splash guard and are a major source of odors & a breeding place for germs. Some splash guards are removable, like this one. But not all of them are. Removable splash guards are very easy to take off. I spray them with @dawndishwash soap & give them a good scrub down with @oxo good grips scrub brush to remove the grim. Then, I let it soak in some vinegar to deodorize. If you have to struggle to take yo