Cleaning burnt tile
Apply about 1 tsp. baking soda to the burn mark. Add about 1 tsp. water and mix it into the baking soda to cover up the burn mark.
Gently scrub the burn mark with the baking soda and water mixture using a soft cloth or brush until it begins to fade. Repeat until the mark is almost gone. Rinse with water to remove the baking soda scrub. Dry with a soft, dry cloth.
Run the fine-grit sandpaper over the surface of the burn to remove any residual markings. Do this very gently. Blend the edges of the burn mark into the tile with the sandpaper to remove any sign of the mark. If necessary, repeat steps 1 and 2.
Apply one coat of tile polish over the burn mark using a soft cloth. Buff until it's absorbed well.