King soda + vinegar foam cleaning
This combination is perfect to remove toughest stains. First sprinkle baking soda on the stains. Then spray vinegar on top. Foam will start to form and the dirt will be loose. Wash well after 20 minutes. If you do not want to take home remedies, then there are many oven cleaning products in the market, which you can use. However, they are rich in chemical, which can sometimes harm health.
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