Things You'll Need
Soft clean dry towel
Mold is a fungal growth that thrives in dark damp places. Mold is unsightly to look at, and it can be linked to respiratory ailments. Mold needs to be removed as soon as you find it because it can spread rather quickly in the right environment. The bathroom has the perfect climate and setting for mold. Getting rid of it is quite easy.
Mix a solution of chlorine bleach and water in equal parts in a spray bottle.
Spray the molded grout with the solution. If you have colored tiles nearby, you may want to use a color-safe bleach or vinegar instead to avoid discoloring the tiles. Allow the solution to sit on the grout for at least 10 minutes.
Use an old toothbrush to scrub away the mold from the grout. If the toothbrush isn't strong enough to remove it, you may need to use a medium to coarse bristle brush. Be careful not to damage the grout by using a wire brush. Rinse the grout with clean water and repeat if necessary. Dry the grout with a soft clean dry towel.
Wear gloves and ventilate the area well when dealing with mold and bleach.