What are the common signs of a bathtub leak and how can I effectively detect and repair a bathtub leak in my home?

Common signs of a bathtub leak include water stains on the ceiling below the bathroom, peeling paint or wallpaper, musty odors, and loose tiles or grout. To effectively detect and repair a bathtub leak, you can inspect the caulking and grout around the tub, check for any cracks or gaps in the tub itself, and look for any signs of water damage. Repairing a bathtub leak may involve re-caulking, re-grouting, or even replacing the tub if the leak is severe.