Never use fabric softener on towels. They leave a deposit which cannot be removed and the towels become less absorbent. As for the musty smell, keep the shower fan on for at least 20 minutes after turning the shower off. In addition, if you have the room in the bathroom, have a ceiling fan installed (that runs via remote control) and run it on low, which is what I had to do to alleviate the same problem. The air flow in the bathroom is awful, even though I have a window.
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