You congratulate yourself for being as green as any caravanner can be, driving a fuel-efficient tug with low emissions, riding the bus that stops at your site and cycling, too. The only mark against you is for cleaning the toilet tank.

But you can change that with these formaldehyde-free biodegradable cleaning tablets, which according to the manufacturer are safer for the environment. Simply pop a tablet into the waste tank and cover it with water. It goes to work instantly, and releases a pleasant smell at the same time.