Tile grout can be whitened through the use of a naturally concocted mixture. This consists of ½ cup of baking soda, ¼ cup of hydrogen peroxide, and 1 teaspoon of dish soap. After mixing the ingredients well, apply it to the grout. The blend should be allowed to penetrate the grout for 5 to 10 minutes. After 5 to 10 minutes, use a grout scrub brush to clean the grout. Finally, wash it clean with warm water.