Recaulking a tub is an easy home maintenance task anyone can do. New caulk not only looks better than grimy old caulk but also provides a better water barrier around the tub. Caulk keeps moisture and soap from entering the space surrounding the tub.
To replace, remove the old caulk with a utility knife and wipe clean with a damp cloth. Place a tube of tub caulk into a caulk gun, or simply buy a small ready to go tube. Snip the end off enough to get a small amount out. Then, run the tip along the tub line, squeezing the tube or gun handle as you go. Run a fingertip along the new bead of caulk to smooth it out, and allow the caulk to dry according to the tube instructions before using the tub.