Passover: Kashering an Oven: Cleaning

To determine whether an oven is clean: 
If there are black or brown spots, scratch them:
  • If the substance crumbles, the spots are OK.
  • If the spots do not crumble, consider the oven NOT clean.
Note If you use the oven's self-clean cycle, you do not need to remove the hard deposits from the oven before kashering.
If the oven is not self-cleaning, you must remove (clean off or burn off) any deposits on the walls, racks, and window. If the stains or deposits do not come off after two cycles of using a strong oven cleaner such as Easy Off, the oven is considered sufficiently clean. Weaker oven cleaners that do not remove deposits may not be relied on.
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