I have a dishwasher that suddenly started leaving black greasy/oily spots on my dishes. If I try to wash them off they just smear and fade but don't easily just wipe off. It seems to me like its a rubber washer or black rubber gasket that is melting or breaking down and getting all over the dishes. Do you know what could be causing this? We recently switched from liquid detergent to pods and it seems oddly coincidental that this started happening. Do you think the pods could be causing the rubber gaskets to corrode? At this point do you think its worth repairing the dishwasher or should I spring for a new one? Thanks and I appreciate any advice.