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Clean Mouse is a skill in the Wind Master skill tree. For each skill point allocated in this skill, a bubble will spawn at the place of a mouse's death. The bubble will appear to go from the bottom of the map and progressively float toward the top of the map. The bubble's behavior is identical to the balloon's; it travels at the same speed and pops when more than three mice stands on top of it.

Bubbles appear quite often in the Transformice cartoon series.

Crane BugOften the bubble will spawn in a different place than where the mouse died.