Yesterday after a longer test drive I bought a C1 with my girlfriend. From driving he was super, the spare wheel pit was under water. But I already knew of these leaks. The trough cleaned and rusted. Unfortunately there are also 3 tiny holes which was not visible at first. I applied rust tugs once and then zinc spray. In the area of crossbars front and the crossbar there is also neat rust. I also conclude that it is too bad. I would like to preserve the rusty parts a little bit anyway. So let’s remove loose rust as far as I can with a brush. With what would you treat? Greetings Thorschden