I am seriously considering not antifouling this year, I have more than plenty still on, and whilst it may not have any copper (or whatever it is thats in it) left to leach out, I am tempted to buy one of these hull cleaning devices. I saw the thread on coke bottles and plastic garden netting etc, but this looks a bit more effective. The only problem is the price which at £200 plus, seems very expensive for what it is. I would probably use it say 3 or 4 times a season. but what if 4 or 5 of us in Shotley were to buy one between us, stored in a locker on a central boat? any mileage in that?