Here is a robotic system that can be used to clean the sides of boats and large objects in a cheaper fashoin. The Climb Rob 125 is a remote controlled robot with magnetic wheels to stick to metal surfaces. It can wash upside down and vertically, so it works on a variety of surfaces.
The robot can clean a 15m high tank in 15 minutes so. Th angle and speed of the jet can be adjusted.
[HT]