Cooking sprays caused my glass baking dishes to look disgusting. Yeck! I found a simple way to clean them with minimal scrubbing!
Simply soak the dish in a solution of 5 parts water and 1 part household bleach. (For me, I soaked one end of the glass dish during the day and the other end overnight.)
Then run it through the dishwasher and it’s sparkling clean and ready to use!