Here is a goal: clean caked on food in the oven

Which way makes more sense to accomplish this goal?

pick from the following.
1). heat to 125* and spray vinegar on the gunk until lightly damp. pour on salt, let cool and clean with a wet towel
2). turn on the oven, and cover the spots with half a lime and some salt. heat for thirty minutes, and cool for two hours. clean with bacon grease on a towel.
1).