When moving the janitor along, keep the left mouse button pressed to keep the cleaning meter full. Develop a sense of timing so that immediately after bopping a petpet, the button gets pressed again to refill the meter.
The janitor will collect water drops as he walks along the hall. Three drops fill his bucket meter at the top of the screen. Save water for emergency use; if a bunch of critters come along at once and the cleaning meter’s low, use the water to douse them. Then swing even a partial bop if you can manage it so the rest of the dirt comes off.
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