I have a few small rust spots on my car (mainly caused by rockfalls) and would like to remove them. I tried this already in winter, it was unfortunately not possible. Either it was due to the modest temperatures or to the used mediums. I first removed the rust completely with a dremel, degreased and applied Nigrin rust brake. Then painted again with paint. Unfortunately, the whole thing gets through again, now of course worse. fertungsmittel can I use otherwise? The best thing would be a link to an online shop, in the hardware store there is not really something else.