How to Clean Mold in a Shower
To clean mold in a shower, start by mixing white vinegar, borax, and warm water to make a mold-killing solution. Alternatively, you can use equal parts hydrogen peroxide and white vinegar. Then, spray the solution on the mold, and let it sit for 15 minutes. Next, wash the mold off using a scrub brush for big areas and a toothbrush for small crevices. Finally, wipe any leftover residue away with a clean, dry towel.
Make a mold-killing solution. Pour ½ cup (120 ml) of vinegar into 1 quart (1 liter) of warm water. Use distilled white vinegar. Then mix in ¼ cup (59 ml) of borax. Mix the ingredients together in a pitcher until they are well-combined and the borax is completely dissolved. Alternatively, you may use 3 percent hydrogen peroxide. However, do not dilute it with water or mix it with borax. Instead, use straight peroxide, or mix 1 part peroxide to 1 part vinegar. You can purchase borax from your local pharmacy or grocery store. Fill a spray bottle with the solution. Then spray the mold with the solution. Make sure to spray a generous amount of the solution onto the affected areas in your shower. You may have some solution leftover. As you clean the mold, re-fill the bottle as needed. Let the solution set for 10 to 15 minutes. Depending on how much mold you have, you may need to let the solution set for longer like 30 minutes to an hour. Scrub the mold away. Use a scrub brush to do this. Scrub the mold in a vigorous back and forth motion until all of it is removed. For small crevices, use a toothbrush to scrub the mold. As you scrub, you may need to spray more solution onto the affected areas to clean them thoroughly. Wipe the area clean. Use a clean, dry towel to do this. Wipe until all the debris and mold are removed. Do not rinse the area with water because any remaining borax will help keep your shower clean for a longer period of time. Alternatively, you may use a vacuum to clean away debris and mold. However, make sure to use a HEPA filter; this type of filter can collect and contain mold spores. Dry your shower. Use a clean, dry towel to do this. Make sure the areas in your shower that collect and grow mold are thoroughly dried. Mix 3 parts baking soda to 1 part water to form a paste. Mix the baking soda and water in a bowl until they are well-combined. You are looking for a mixture with a toothpaste-like consistency. If the mixture is too thin, then just add more baking soda until a thick paste forms. Apply the paste onto the stained areas with a sponge. Let the paste set for 10 to 15 minutes. For tough stains, let the paste set for longer like 30 minutes to an hour. Scrub the stains. Use a scrub brush to do this after the paste has set for the allotted time. Scrub in a vigorous back and forth motion until they are gone. Use a toothbrush to clean small crevices. If the stains remain, then you may need to repeat steps one through three again. Wipe the area clean with a damp towel. Wipe until any and all paste, debris and grime are removed. Then use a clean, dry towel to wipe your shower down until it is completely dry. Turn on your ventilation fan. Make sure to do this while you are taking a shower or bath. Also, leave it on for an additional 30 minutes after you get out of the shower. If you do not have a ventilation fan, then keep your bathroom windows open during and after your shower. Spray down your shower with a water-vinegar solution. Do this after you shower three to five times a week to prevent mold growth. Mix equal parts water and vinegar, and fill a spray bottle labeled “shower spray” with the solution. Keep the spray bottle handy in your shower or bathroom. If you have children, make sure to keep the spray bottle out of reach. Wipe down your shower with a dry towel. Do this after you shower five to seven times a week. Make sure to wipe down and dry your shampoo bottles, cleansers, toys, and other objects in the shower as well. Keep a designated towel handy in your bathroom for this specific purpose. 
Make a mold-killing solution. Fill a spray bottle with the solution. Let the solution set for 10 to 15 minutes. Scrub the mold away. Wipe the area clean. Dry your shower. Mix 3 parts baking soda to 1 part water to form a paste. Apply the paste onto the stained areas with a sponge. Scrub the stains. Wipe the area clean with a damp towel. Turn on your ventilation fan. Spray down your shower with a water-vinegar solution. Wipe down your shower with a dry towel. 