So the beaters that came with my mixer are not stainless steel, and washing them in the dishwasher creates a black film. The product manual clearly states this, but I ignored it.  However, the film is pretty easy to remove with a little scrubbing.  There is no need to throw the beaters away. Just wash them by hand and dry carefully. I love my mixer. I did not have a stand mixer until I was in my 60s, and now I don’t know how I lived without it!