As porous material, grout acts like a sponge and soaks up everything: dirt, grease, mildew, soap scum, even hard water. “That’s why grout tends to look discolored long before the tiles do,” says ...

Like baking soda and hydrogen peroxide, cream of tartar and lemon shockingly has cleaning and brightening properties that are effective for lifting dirt and stains off grout lines. Mix a combination ...