If there are litter boxes in the shower in the bathroom then they’re ready to be cleaned. Be sure to wash your hands well after cleaning boxes!
Step 1: Please scrape as much cat litter out and into the trash as you can to minimize what goes down the drain.
Step 2: There is a special smiley face scrubbing sponge that works well. Use Simple Green, dish soap, or another general cleanser for the first scrub.
Step 3: Rinse well and leave upside down in the shower area to dry.
Step 4: Once dry spray it with a dilute bleach solution and let air dry.