50's bathtub grout
The bathroom in my 1950's ranch is damp ALL the time. There is a window above the bathtub that is opened during every shower, but the moisture still builds up. Is this the reason for the mildew and mold that I am constantly battling on the bathtub tile grout? Will an installation of a fan/vent clear up the mildew problem or could it be from moisture build up behind the tile? (I don't think that's the case because behind the tile is inches thick concrete mortar...) Any information will be much appreciated. I'm trying to decide if I need to replace the bathtub tile.