Caulk a tub or shower
Caulk is the first line of defense against water getting behind a tub or shower. The video here compares latex, silicone and butyl, and the rule is to match the product to the joint: wet areas want a caulk made for them, painted trim wants a paintable one.
Remove all of the old caulk, clean and dry the joint, and tape the edges for a straight line. Cut the nozzle small, apply steady pressure with a caulk gun, and tool the bead once. Do not run water until the caulk has cured, as long as the label says. If the grout is cracked, regrout the tile first. Moldy caulk behind the bead means water is getting in; check what is behind it.
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