5. Recall all Unattached non-Unit Gear and non-Unit Runes at Battlefields, and all Permanents and Runes in Bases other than their controller’s. Remove all Hidden cards from all Battlefields that are not controlled by the same player and place them in their owner's Trash.
§ 323.7 Core Rules PDF (officieel)
§ 323 When a Cleanup occurs, the following Tasks become Outstanding in the order described:
