I have a self cleaning oven, but the door and especially the window don't get very clean after running the self-clean cycle. I can't seem to figure out what I can use to get them clean before I run the cycle. I realize they probably won't ever be spotless again, but I don't want too much to build up. I have tried oven cleaner following the instructions for a self-clean oven, but it didn't seem to make much difference. Any magic tricks out there? Thanks!