Step 1. Put on gloves - Put on kitchen-grade cleaning gloves to keep your hands dry.
Step 2. Add lemon to water - Cut a lemon in half, squeeze the juice into the water-filled dish, and add the lemon halves to the water.
Step 3. Place the lemon water into the oven - Place the dish into your oven, and turn your oven on. Set your oven’s temperature to at least 200° F to generate steam.
Step 4. Wait for steaming - Wait 20-30 minutes to let the steam penetrate stuck-on grime.
Step 5. Remove the dish and turn the oven off - Remove the dish carefully and turn your oven off. Let your oven cool down.
Step 6. Remove the oven rack and clean the interior - Remove the oven racks and wipe down the interior with a clean, soft cloth.
