I just baked my first loaf of homemade bread and have fallen in love with the kneeding and texture of the bread. However, my bread pan is in a sad state. It's your generic non-stick from Walmart but its like the bottom and sides have rusted. Something is stuck on the metal. I've tried soaking it in hot water and washing in the dishwasher. I will admit that sometimes I've let it soak and forgotten about it and gone back to it in a day or so, and it leaves a rust-like mark on my stainless sink. Have I missed something when it comes to how to clean/store/use breadpans?

 thanks.