I recently bought a beautiful (and expensive) set of Wilton Armetale silver serving trays - the kind that can even go in the oven to keep your food warm. Well, I was very dumb and did not read the directions, and ran them through the dishwasher (which apparantly is a big no-no). Now the silver surface is cloud-y looking, like its dirty but will not wash off. Are they ruined? Is there anything I can do to fix this?