San Diego has a big problem in that later half of spring and in the summer...mold. Especially mold in bathrooms. You might notice mold and mildew growing in your bathroom, particularly on the caulk used on your bathtub or shower. This is an even bigger problem for poorly ventilated areas, like in small apartments.
Why Does Mold and Mildew Grow on the Caulk?
Mold grows in humid areas where the spores can find sufficient moisture. The spores that reside in homes find themselves in the caulking of showers and bathtubs. They doe this because caulk is porous and can retain moisture. Poor ventilated bathrooms allow them to multiply freely in the dark and humid atmosphere.