Droppy

Droppy is a cleaning robot enemy in Mega Man 11. It appears exclusively in Acid Man's stage, as it was designed to clean out the insides of the chemical pipes in his lab and dispose of trash in the tanks. Droppy appears in underwater sections and slowly moves up and down over a set spot. Droppy and its variants are also spawned by Cyclone W during its battle.

Brushy
Brushy is an improved version of Droppy with more cleaning power. It usually acts the same way as Droppy, but when Mega Man gets close, Brushy will start moving much faster to try and hit Mega Man.

Wipey
Wipey is an even stronger version of Droppy that behaves the same way as Brushy, but is indestructible and deals more damage than Droppy and Brushy.