Trying to remove burnt-on food from glass cookware can be a real bummer, especially when elbow grease doesn't make stubborn stains budge. Several solutions do work, however. Soaking the cookware is standard operating procedure, and boiling liquids in the glass pan may help get rid of tougher stains. For the toughest marks, apply oven cleaner, let it sit overnight, then wash away the gunk.
Fill the dish with water, making sure that the water completely covers the burnt-on areas.
Add as many as six Alka-Seltzer tablets to the water-filled cookware. Or squirt fabric softener into the water.
Soak the cookware for at least an hour, then easily scrub away the debris with a scouring pad.
Add 1 part vinegar to 4 parts water in your glass cookware.
Bring the vinegar and water solution to a gentle boil over a stove burner for approximately five minutes.
Let the cookware and solution cool, then gently scrub off what remains.
Put on a pair of rubber gloves and completely coat the burnt-on food in the cookware with oven cleaner.
Seal the cookware in a garbage bag, making sure to close the bag tightly to prevent the fumes from escaping. Let the cookware sit overnight.
Remove the cookware from the bag, keeping your face as far away from the harsh fumes as possible. Thoroughly wash the cookware with dish soap or in a dishwasher.