Allow the dishes to reach room temperature before putting them in water. Rinse off dirty dishes in the sink to remove recent food residue.
Fill the sink with warm water and a few squirts of mild dish soap. Gently set the Pyrex dishes in the water. Wash only one or two at a time if the pieces are large to avoid the chances of one dish chipping another.
Soak a sponge or washcloth in the water. Wipe down each dish with the sponge or dishcloth, covering the inside and outside of the dish. Scrape at baked-on food with your fingernail. If the substance does not come off easily, soak the dish in the water for at least 10 minutes and dry again. Wipe away the residue with the sponge or dishcloth once the food loosens.
Rinse each dish under warm tap water after washing. Dry each dish with a soft dish towel.
Sprinkle baking soda onto a damp sponge or dishcloth to remove stains that do not come off with regular dish washing.
Scrub the affected area with the baking soda past on the sponge or dishcloth, then rinse off the Pyrex. Apply more baking soda to the sponge and scrub the dish again if necessary.
Apply baking soda to the sponge and rub any gray scuffs caused by metal utensils. Use a powdered cleaner safe for both dishes and glass cooktops if baking soda does not work.
Wash off the dish with a mild dish soap, then rinse and dry it once the stain is removed.