Any Suggestions?

I, umm, slacked on the dishes.  Not in their entirety, just a few.  Unfortunately those that were neglected, I realize in hindsight, should have been dealt with sooner. 

I made yummy individual broccoli and cheese frittatas that the boys ignored the first time we had them but they goobled them up once they were leftovers, go figure.   
It's a combination of not being well enough greased, baking on, and then sitting out too long.  :-/  Just the sponge doesn't really touch it.  I've soaked it, which hasn't helped a lick.  And scrapped at it with a spoon, which is helpful but tedious and the spoon doesn't do much of a good job in the corners.  Any other brilliant ideas?  I've already tossed around the idea of just tossing it and getting a new one next time they're on sale but that seems foolish.  My mom is on her way to visit for a few days and I'd rather her not think I save all the big messes for her.  ;-)