What is the best way to clean shower grout mold effectively?

To effectively clean shower grout mold, mix equal parts of water and white vinegar in a spray bottle. Spray the solution onto the moldy grout and let it sit for about 10-15 minutes. Scrub the grout with a brush or sponge, then rinse with water. Repeat if necessary. This method is effective in removing mold and preventing it from coming back.