The temperature of the water should be around 105 to 115 degrees Fahrenheit (40 to 46 degrees Celsius). You can purchase specially formulated Corningware cleaners online.
Repeat steps one and two for hard-to-remove stains.
Cleaning your Corningware with a dishwashing detergent is optional and may not be necessary.
You may want to spray your dish outside to avoid getting oven cleaner on any surfaces in your kitchen. You can find oven cleaners at your local hardware or grocery store.
Place the bag in a shaded area outside; do not place it in the sun.
Do not use metal pads to scrub your Corningware; these will scratch it.
The water should be at least 105 degrees Fahrenheit (40 degrees Celsius).
If some stains remain, then repeat steps one through three again.
