Add the distilled water to the 20 oz. spray bottle. Distilled water is much cleaner than tap water, and it is excellent for use in home freshening formulations.
Add the bleach to the bottle of water. Drop in the baking soda, which is a natural odor neutralizer.
Secure the cap on the bottle and shake it vigorously for a minute. This disperses the ingredients, watering down the bleach so it doesn't damage fabric or other surfaces.
Clean out your closet, removing clothing and stored items. Make sure it is completely empty for cleaning. Open windows around the area and any doors to let sunshine in while providing air flow to the area. If necessary, vacuum and dust the closet if it is needed.
Spray the entire inside of the closet with the bottle of bleach and baking soda solution. Do not saturate the carpets or walls. Instead, spray a fine mist over the entire area. Let the area air dry for one hour and then repeat once more.