When an oven remains dirty with baked-on carbon crusts and grease spots even after completing a high-heat self-cleaning cycle, it is usually because the cycle was too short (such as a light two-hour setting), or because the baked-on carbon deposits were too thick for heat incineration alone. Self-cleaning turns loose grease to ash, but heavy, carbonized spills often require manual scrubbing. You can troubleshoot cleaning limitations easily. You can verify that your corrective action is successful when applying a natural baking soda paste to the remaining stubborn spots, letting it sit overnight, and scrubbing gently with a non-scratch pad removes the lingering grime and leaves the porcelain spotless.
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