The appliance repairman told me using the self-cleaning feature takes years off the life of an oven. The best oven cleaner! Cover bottom of oven with baking soda, then pour vinegar so it's all wet. Let sit around 20 minutes or so then wipe all of it out with damp cloth or sponge. I leave my oven door open too. After drying you may see some white residue, wipe again.