bessnfloyd
Administrator
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This is usually a combination of age, grease and smoke. I put mine on the top rack of my dishwasher, and they almost never turn yellow although the color does go a little with age. Sometimes someone has given me a dish of something in a disgustingly yellowed container or lid, and if I run it twice through the dishwasher, it comes out almost like new!
You could also try soaking them with a little somewhat hot water, with either degreaser or descaler, and see what happens Also you could try spraying them (on newspaper) with oven cleaner, leave for a few minutes, then scrub and rinse with a scratchy sponge.
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Bess W.
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