Expect the galaxy to appear rather like a damp spot on an otherwise clean window.

Molds are usually not a problem indoors, unless mold spores land on a wet or damp spot and begin growing.

They like damp spots, so the dry weather as well as the cold has probably held them back.

Wonky cupboards, a crack in the floor and damp spots on the ceiling.

Damp spots were removed by means of disinfectants like quinine or phenol.