We have been living in our house for 2 years and we have replaced the caulk around our tub and tile surround three times in that time. The last time we replaced the tile I carefully cleaned away the grout and old caulk and even bleached it in case our troubles are being caused by mold. We filled the tub with water so that the weight would keep the tub settled, put the new caulk on and let it cure before we emptied the tub. Now about 6 months later, we have cracked and moldy caulk closest to the faucet and spout in the tub. We have had to replace the tub caulk about every 6 months or so. What can we do to not have to replace the caulk every 6 months?!