Many kitchen counter tops are made from various types of stone: granite, marble and limestone, among others. If untreated, some stone surfaces are very porous and vulnerable to stains from liquids, moisture or exposure to heat. While it is best to pretreat kitchen counters to prevent such staining, if they do occur, it is possible to treat the area and remove some, if not all, of the stain.
Mix together 1 part all-purpose flour with 2 parts hydrogen peroxide in a glass container.
Dab a clean cloth or soft brush into the mixture and apply to the heat stain, completely covering the stain area.
Leave the mixture on the stain for up to one hour.
Wipe the area clean with a clean, damp cloth to remove the paste.
Repeat as necessary until the stain is gone.
Remember to avoid placing hot items, such as hot pots, pans or dishware, on countertops that are not heat resistant in order to avoid heat marks and stains.