I fought for many years trying to convince manufacturers to put a plastic (UHMW) drain plug in the bowls of their mixers. Some did it, but others never did. The bowls can be retrofitted with a plug by welding on a 4X4 piece of 3/8-inch stainless steel on the outside bottom of the bowl (typically, near the outer edge, just before it goes vertical). A 1-inch or larger, hole is drilled and tapped, then a plastic plug is made for the hole. The plug is threaded, has a square head, and is rediused to the contour of the inside of the bowl. If you go this route, be sure to get several extra plugs made as Home Depot doesn’t carry anything like it. With a drain plug, you can easily clean the mixing bowl by putting in a gallon or two of hot, steaming water, brushing down the inside of the bowl with a sanitary plastic pot brush, then covering the bowl with a piece of plastic so it can steam for a few minutes, then come back and finish cleaning. Put a plastic bucket under the plug, remove the plug and force the water to the drain hole. Finish with a sanitizer rinse and wipe out with paper towels, put the plug back in and you will be good to go the next day.
I saw where there was some concern about getting the dough out of the mixer, just pour a cap full of oil along the inside edge of the bowl when the dough is finished mixing, then cut it out in chunks. This is not any more difficult than cutting it out of a planetary mixer bowl, or pulling a bowl and and lifting both the bowl and the dough up onto a bench top for cutting.
Tom Lehmann/The Dough Doctor