double bucket mop trolley is a cleaning tool used for mopping floors. It typically consists of a trolley with two buckets, one for clean water and one for dirty water. The mop is dipped into the clean water bucket and then used to mop the floor. Once the mop becomes dirty, it is rinsed in the dirty water bucket to prevent the mop from spreading dirt around. The trolley typically has wheels for easy movement and a wringer to remove excess water from the mop. Double bucket mop trolleys are commonly used in commercial cleaning settings such as hotels, schools, and hospitals.