I found that some shortenings (butter flavored) left a coating on my favorite aluminum bundt cake pan even after washing with hot soapy water. I cleaned it with a brillo pad and now only use plain shortening and flour coating and it comes out great every time. I did have a few ugly cakes before I discovered the problem. If you will take the stuck parts of the cake out of the pan and chop them finely and maybe toast them in the oven a bit, then use a glaze to adhere them to entire top of cake, it will make an ugly cake presentable and adds a little crunch to the top.

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