My non-motorcyclist god-gat has got himself a two-wheeled, motorized driving something … see my Sig. ( I can’t write this out here ). We will then restore the thing over the winter. In order to be able to drive, the rust has to get out of the tank. Now to the various methods known to me: 1. Let the expert do it – No need, no desire to send the tank back and forth. 2. pebbles and nitro and then shake – the times are v orbei and the resulting mucke is not my case 3. Coke – well, we drink it better then – but the principle with phosphoric acid (even more concentrated – just how strong ?) – would also be a possibility. Only in the tank ? I am right that the rust does not dissolve but only oxidizes and then you have to scratch everything down, right? Now I got a tip for solution no. 4. I am interested now if this has already been tried out. And indeed: Take the tank. Fill it (naturally developed) with a mixture 3:1 with water/sodium hypochlorite … so chlorine … not in pure form but the toilet cleaner (e.g. the Klorix stuff). Now take a charger for motorcycle batteries and hang the positive pole of the charger into the solution in the tank, and fix the terminal so that it can not come into contact with the inner wall of the tank (otherwise there is a short circuit!). The minus pole then becomes to an unpainted place on the tank, z .B. clamped to the thread from the gas tap and the miracle can begin. After 2 – 3 hours the rust should be gone. An advantage would be the disposal of the mixture. Does anyone know this already? Is the attempt worthwhile?