Yeah, we have the same exact reaction when we notice mold on the bathroom ceilings. Mold is one of those insidious things ...

You can paint your bathroom with mold-resistant paint ... You might have to throw away absorbent or porous materials, such as ...

Grout issues in a bathroom or laundry room on a higher level are a danger too. Water can seep between the tiles and under the floor, pooling on the ceiling below and driving mold proliferation.