Burned-on blobs welded to the bottom of your oven can give off odors and smoke. If you have time to run a self-cleaning cycle — even a short two-hour one — it’s your best bet (and you can go do something else while it works). But, if you do not have time time to wait for the oven self cleaning cycle to run through, just focus on the worst stains. Follow these quick and simple steps.
Take a metal spatula and gently chip off any loose pieces — with any luck, this alone might do the trick. If not, liberally spritz with full-strength ammonia from a spray bottle. Leave it for at least five minutes, then sprinkle on enough baking soda to completely cover the stain; add just a few drops of white vinegar. Let it bubble for a minute or two, then whisk away the grime with a scrub sponge. Rinse with a clean, wet, regular sponge.