The down stair bathroom is a shower stall, plastic / composite wall and caulking between panel. It was molding like crazy ever since I start using the glycerin soap.
The up stair bathroom has a tub with sliding door, and tiled walls that has unsealed grout. It mold a bit but not as bad as the down stair bathroom. When I do clean my wife told me to use about 10% bleach solution but it doesn't seems to completely clean it out (it does clean somewhat, probably about 70% I'd say).
I know, I should clean it once in a while but I never do, just too busy in life. I used to use Ivory but I think it dry up my skin pretty bad, and the Olay glycerin soap is just "too sticky" afterward. Recently I replaced the old caulking with DAP's Kwik Seal Ultra (supposed to be lifetime mold resistance guarantee).