A pool cleaning robot for cleaning a surface of a swimming pool, said robot may include: a main housing; main wheels being configured for propelling the robot and for rotating at a first angular velocity; at least one auxiliary brushwheel disposed between said main wheels; and at least one inlet being formed in a bottom panel of the housing between said main wheels and being configured for intake of water and debris; wherein said robot is configured for rotating said auxiliary brushwheel about an axis of rotation at a second angular velocity which is substantially greater than the first angular velocity; wherein said second angular velocity is at least substantially twice that of the first angular velocity.