While you should keep a specialty cleaner handy for your glass-top stove, the answer to more immediate food dilemmas may be hiding in your kitchen. Baking soda, white distilled vinegar or lemon juice will work wonders for cleaning stubborn food stains. Wait until the glass top has completely cooled and wet a sponge or microfiber cloth with water. When using baking soda, pour it directly onto the range, and let it sit for a while. Scrub the surface with the wet cloth, and the burnt food should wipe off.
With lemon juice or vinegar, you'll need to do some quick ingredient mixing first. Fill a spray bottle with hot water, and add either lemon juice or vinegar. Spray the solution directly on the grimy stain, and wipe with a clean cloth. Repeat as necessary. For both methods, don't forget to rinse the clean spot again and wipe it completely dry with another cloth.