The answer to the riddle is: Vinegar

White vinegar is a natural and effective mold killer.

Here’s how to use it:

Spray the affected areas of the shower tray generously with undiluted white vinegar.
Let it sit: Allow the vinegar to sit for at least 30 minutes, or even longer for stubborn mold.
Scrub: Scrub the affected areas with a stiff-bristled brush.
Rinse thoroughly: Rinse the shower tray thoroughly with clean water.
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