Ok I put my stainless steel parts to meat grinder in dishwasher. I know, I know. I have preached to wife and kids to never, ever, put it dishwasher. Well she was sick in bed and me and the boy was left to clean up kitchen after making sausage. Well my back was hurting and we was in cleaning mode and it wound up there. Now it got a black oxidizing color and turns everything a gray, black color it touches. I did this once with an old one, and just wasted the first few pounds of meat. I don’t wanna do that again. There has to be a trick to get this junk off. I have tried hot soapy water and vinegar. Takes the initial layer off but metal is still gray. Any help please.