Jan 12, 2010 · Gray residue on aluminum sheet pans, pots, saute pans and garlic press. bucksguy14 | Jan 12, 2010 09:33 AM 42. I hand wash all of my aluminum pots, pans, and utensils, using Dawn dish detergent. I've never put any of them in the dishwasher. Within the last 67 months, I've noticed a gray residue on the sponge and cloudy dishwater when I wash ...