I recently bought a 9-liter ultrasonic cleaner (a Kendal). I'm still figuring out how best to use it and what cleaning solutions work best. I've now used it several times to clean up the metal shelves/racks on my MES 30. It removes the smoke and food residue in just a few seconds. I've also now used it to clean the big "disposable" aluminum pans that I use to catch drippings, hold ribs during the "1-2-3" cooking process. While the ultrasonics will perforate aluminum foil, the pans are thick enough that the ultrasonic waves do not perforate the surface. It takes only a few seconds to get the pans looking like new. The nifty thing about the cleaner is that it gets out the food and grease just as well from the little folds in the pan as it does from the flat areas. Today I thought I'd clean the MES vent and also the shelf/rack holders. I removed the shelf brackets and cleaned both racks, as well as the screws. One neat thing is that the ultrasonic waves easily reach down into the Philips head grooves in the screws and remove the grease. Here are the two shelf supports. One has been cleaned, and the other hasn't yet been touched. The slight blackness you see in certain areas on the right-hand picture are shadows; the dirt is 100% gone. These ultrasonic cleaners are not cheap (several hundred dollars), so it doesn't make sense to get one just for this chore. However, if you can find an excuse to get one, you'll love what it can do for smoker and BBQ parts.