For home owners who are currently in the process of building a new home, what they can do is incorporate a remote timer and this would give them the ability of being able to turn the fan on in the middle of the day or at night remotely. Likewise, you can also consider wiring in a dehumidistat, so that the fan would be able to run whenever you need it.
Lucky for you, there are paints to help. Rust-Oleum makes a "mold and mildew-proof" paint for about $27 a gallon that can protect those mold danger zones. You can fight those nasty germs with Sherwin-Williams' Paint Shield, which costs about $85 per gallon. Unlike other microbial paints, this formulation is EPA-certified to kill more than 99.9% of surface bacteria in less than two hours, including E. coli and staph.