We are getting ready to put our house on the market and really want to solve this problem before we do w/out too much expense. I just can't pass this problem onto the next person. Our house is almost 10 years old. It's 6 x 13 with a tub/shower unit. The exhaust fan is 100 CFM but really doesn't seem to pull much. You can put a piece of toilet paper to it and it'll hold but it doesn't really "suck" onto the fan like it's getting pulled up. The tub/shower unit is on an outside wall and there's a cold air exchange that runs behind the wall behind the head of the tub. I haven't had any problems wiping the mildew off the walls and ceiling, but the walls will literally look like moisture is running down them. It does seem worse in the wintertime, but will notice it during warmer weather also, just not quite as bad. If you take a shower and leave the door shut, the exhaust fan won't really clear the mirror. I think the cold air exchange could possibly have something to do with it, (but I hope not a lot because there's not much we can do with that) and our bathroom is usually pretty cold because we don't really heat it, but the water temperature is pretty high. Do you think just lowering our water temperature and possibly getting a low flow shower head would help. Also, our walls are painted with a flat paint, and I thought maybe a different paint would help. Any suggestions??