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.
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Cost-efficient tank cleaning with high-pressure jet systems. Container & tank renovation with robots
The robot can clean a 15m high tank in 15 minutes so. Th angle and speed of the jet can be adjusted.
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