Caulking the connection between your shower walls and tub prevents leaks and reduces mildew buildup. Removing old caulk and recaulking joints between tiles and your tub is an annual bathroom maintenance job.
If you have tile shower walls, as the house moves (a natural process that occurs in every home), a hairline crack can occur that allows water to get into the joint. Therefore, it is a very good idea to maintain the caulk in your shower. There’s another good reason to recaulk. If you’ve tried to remove the black mildew stains from caulk, you know the blemishes are often unbudging. That’s because the stains are often behind the caulk — between the caulk and the wall.