On Jan 31, 8:43 pm, "
wrote:
I've got a bathroom in a house which is getting mildy on the ceilling
atop the shower.

The fan is on, but it doesn't seem to solve the problem.

Anyone know a strategy for preventing this?

Anything I can put on the walls and/or ceiling?

1 - Do you know if the fan is rated for the size of the room? I had to
oversize my fan (2 X) to keep the mold off the ceiling.
2 - Do you know if the fan is actually venting the room? Perhaps it's
blocked in some manner.
3 - There are additives that can be mxed in the paint to help retard
mold growth.

P.S. I don't know where you live, but wherever the weather gets cold,
almost all bathrooms are "windowless" from a ventilation perspective.