Caulking is the rubbery sealant you see around your showers, tubs, and sinks. It is a crucial material for protection against water damage in high-moisture areas. Having your caulking replaced regularly is extremely important as caulking loses its integrity over time, often peeling, shrinking, and cracking, allowing water to seep through to unwanted areas. Leaving old caulking also creates the perfect breeding ground for mold and mildew, aging the entire look of your sink, shower, or tub surround.