Wash the shower liner
What to do
Check the care label first. If it can go in the washer, run the liner on the gentle cycle in warm or cool water, never hot, with a couple of towels. Hang it back up to air dry; no dryer.
Why it matters
A shower stays damp, and damp spots are where mold and mildew grow. Washing the liner clears the buildup before it stains.
What you need
Washer, detergent, a couple of towels