Black spots on plastic items
I have the same problem on my Bosch dishwasher Model # SHX33A05UC. It is about 6 years old. I have replaced three gaskets and it did not solve the problem. I am a 25 year mechanical engineer. I do not recommend anyone changing these gaskets on their own except for the long dishwasher door gasket (which goes along the top, left and right door edges) which is quite easy to replace. The other two gaskets, which were quite difficult to replace, were the gasket at the bottom of the dishwasher door and the sump pump gasket. I am still having the tar like black tiny dots depositing on my plastic tupper wear on the second shelf. I will likely not buy a Bosch dishwasher ever again. I will make my decision after hearing what Bosch tech support has to say about what I need to replace next. Could it be the rubber drain check valve not operating correctly? I need to find out. I have spent so much time trying to solve this black tar dot problem!!!
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