The shower/tub in our house is a DIY disaster. It has been "re-done" several times, but without any success. It has been leaking into the basement for some time. However, just recently we have discovered it is leaking slightly into the room next to it. The shower is in dire need of re-caulking and a new shower head. Once that is done it should stop the leaking, BUT is that enough? What can/will happen because of the years of water damage? Any cost-friendly suggestions?