So Who Cleaned The Bathroom?

Wiki:

An akaname (, aka"mud licker") is a yōkai, or Japanese monster, that looks like a frog-like human with wild hair, a long tongue and feet that end in a single clawed toe. It can be found in bathrooms by toilets and bathtubs. It usually enters at night when no one is around to bother it and uses its tongue to lick the bathroom surfaces clean. Despite its grotesque appearance, an akaname does not pose any threat.