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Larry asked: How do I remove burn marks off of Pyrex glass cookware?
Greasy 
edges and burnt on food can quickly leave their mark on glass cookware. The burnt on residue can be removed with a few simple steps. Here’s what you need to do:
You Will Need:
- Baking soda
- Water
- Ammonia
- Spray bottle
- Sponge or soft cloths
Steps to Remove the Burnt Stains:
- Moisten the sponge or soft cloth with water.
- Pour a couple teaspoons of baking soda onto the cloth or directly into the glass cookware.
- Scrub the burnt areas with the baking soda and soft cloth until they are removed.
- If the stains remain, rinse with water.
- Spray the surface with ammonia.
- Scrub again with a soft cloth.
- Rinse and repeat if necessary.
- Once clean, wash the item as usual to remove any cleaning residue.
Additional Tips and Advice
- If you need more scrubbing power, try a nylon scrubbing pad. They won’t scratch the glass, but offer more cleaning power than a soft cloth.
- If you don’t want to scrub, use a denture cleaner instead. Simply fill the pan with water, then drop in a denture tablet and allow it to fizz as long as needed.
- If the pans are really bad, place them in a garbage bag, fill it with enough ammonia to keep the pans wet, tie it off and let them sit overnight. In the morning remove the pans, dispose of the ammonia and the marks should rub right off.
- An alternative to using ammonia is to use lemon. Fill the pan with water, put in a sliced lemon, and bring the water to a boil. Let it simmer for a few minutes, then cool the pan and scrape off the softened residue.
How can I remove yellow stains from a glass turntable plate in my microwave? I have tried many cleaners for glass, plus plenty of hot soapy water to no avail. Regards, RG
Ronnie,
You can try the suggestion in the Additional Tips section of the guide How to Clean Stains and Oil from Glass Bottles of soaking the glass item in an mix of equal parts lemon juice and hot water overnight. You could also try using some baking soda on a damp cloth since baking soda is a mild abrasive. There are more ideas for removing yellow microwave stains on the article How to Remove Stains in the Microwave that you could try as well, such as acetone nail polish remover or a Magic Eraser.
I’ve tried all of the following ideas. So far unable to remove the stains from my glass lid. I even tried combinations of the above mentioned ideas; no luck.
I use a steel wool pad with undiluted dish soap and a little elbow grease.
Oven cleaner will take burns off even if it’s tough stained.
I was about to toss my large frying pan lid after I burned the crap out of it with my amazing cooking skills. I can’t wait to try 1 or more of these techniques to save the poor devil. I’ll send you a full report of what happens. Thanks for enlightening me.