What is the pink stuff growing in and around my sink/tub/washer, etc.?
Pink, black, red, brown, orange, and salmon colored “stains” often appear in areas that are frequently wet. These “stains” are not from the water, but are caused by airborne mold, mildew, and bacteria. Collectively we call these things biological growths. Biological growth occurs despite frequent scrubbing and disinfection and is very frustrating. It may be very troublesome one year and disappear the next. It may reappear weeks after scrubbing or months later. It is typically worst during the summer time. The common factors that lead to these growths are moisture, nutrients, and the nature of the surface. Areas that are dry all the time do not support biological growth. Surfaces that are exposed to soap, food, body oils, or human wastes provide sufficient nutrients for biological growth – even if the surface looks clean. Surfaces that are porous like caulk, grout, plastic, paint, etc. retain moisture, resist cleaning, and provide nutrients for biological growth. The best way to minimiz
