The silicone in your shower is a great spot for black mold to grow, because it is a pliable surface that holds moisture and is generally damp and dark. The amount of moisture along with the lack of air circulation in a shower can lead to the growth of these unhealthy mold spores. Cleaning and mold prevention are important to both the appearance of your shower silicone and the health of your family.
To kill the mold on shower silicone, you can choose from several chemicals, such as bleach and ammonia, or you can choose an all-natural product that you can mix yourself. One option is to fill a spray bottle 2/3 full of white vinegar and add 2 tsp. of baking soda. Allow the fizzing to die down before installing the sprayer top. Whichever product you use, simply spray the shower silicone and mold and allow the mixture to set for about an hour. This will kill the mold spores and keep them from continuing to grow and spread.
Once you have given your chosen product time to kill the mold spores, you get the fun job of scrubbing the mold off your shower silicone. The best way to go about this is to use an old toothbrush and an old towel. Scrub all of the silicone and rinse it with very hot water. While mold thrives in warm, damp places, the heat will kill any spores that remain after scrubbing. Rinse your entire shower with very hot water and dry with a clean towel.
To keep mold from coming back, it is important that you don't provide a good growing environment. Simple things like drying the shower when you finish using it, spraying the shower walls with vinegar once a week, running a fan or dehumidifier in the bathroom and letting in lots of natural light will help to prevent the recurrence of black mold.