Lay a barbecue grill rack on the lawn overnight--the dew will combine with the enzymes in the grass to loosen any burned-on grease. Try it with messy oven racks, too.
Put about a half inch or so of ammonia in a glass baking dish (don't use metal) and leave it in a cold oven overnight. The grease and gunk will scrub off easily. It's a lot cheaper than oven cleaner.
By Sherry
Related: 
Cleaning Oven Racks
Like ThriftyFun on Facebook
