Step 3: Prepare the water dish.
Fill your heatproof dish or baking pan with a couple of inches of water. If you have a really oily oven, consider adding a cup of vinegar to the water. Vinegar is a natural degreaser that will increase the cleaning power of steam.
Step 4: Place the dish into the oven.
For illustrative purpose only
After the oven has warmed, set the dish of water on one of the middle racks. Make sure it’s firmly positioned to prevent spills. Close the oven door and let the water to steam for 20-30 minutes.
