Drip marks down all the walls--why?
When we bought this house, the walls in the first floor bathroom looked terrible, with drip marks on all the painted walls. We cleaned the walls really well, and re-painted with a high-quality latex paint with mildewcide. Now the walls look terrible again, and show drip marks everywhere. The drip marks are not 3-dimensional; they are just slightly darker than the wall color, and they are on ALL the painted wall surfaces.
The bathroom is approximately 9' x 6' in size, and has a plastic (fiberglass? acrylic?) surround shower/bath with sliding doors that don't go all the way to the ceiling. There is no exhaust fan, so I'm sure that's part of the problem, but is that the whole story? I've lived in other places w/o a bathroom exhaust, but have never seen this issue before. The shower gets used an average of once daily (it's not the only shower/bath in the house).
Should we just plan to install an exhaust fan and then repaint? Or is it likely that there's more going on here? I'd like to replace the tub/shower surround and sliding doors at some point, but money is tight now. In any event, I'd like to understand the Big Picture.