Step 1: Cut the lemon with a knife.

Step 2: Squeeze the lemon juice into the bowl by hand.

Step 3: Pour the right amount of water into the bowl.

Step 4: Then put the bowl in the oven.

Step 5: Close the oven door and set the heating time for 5 minutes (lemonade contains citric acid, which can dissolve the scorch stains on the oven when heated into steam).

Step 6: cut off the power supply after five minutes (to prevent accidental electric shock during cleaning).

Step 7: Take out the bowl.

Step 8: Carefully wipe the burnt stains on the oven with a rag.

Step 9: Remove the scorch stains from the oven.