A source of frustration for me is finding spots of rust in my baking pans, even after carefully washing and drying them. I have found a good way to prevent this. Right after I remove baked goods from the pans, I wash the pans and dry them with a dishtowel. Then I put them in the oven, which has been turned off. The residual heat is just enough to thoroughly dry the pans and remove any moisture left behind in hard-to-reach spots. This is especially effective for muffin tins, air-insulated pans, and any baking sheets or pans with rolled edges or rims. A few minutes in the still-warm oven does the trick.
Maria Olaguera, Overland Park, KS