Cleaning the tanks is a process which is simple but easily can cause some troubles. Cleaning the outer layer you can you a pressure washer – it should work. When you want to clean inner site you can also use that device. Before you start remove all the heat exchanger coils carefully, don’t cut the rubber membrane. Also the pressure washer can cause some damages in the surface of it, so remember to wash it carefully. After processes place all compactness on their place.