I have just purchased an M farmall that has been sitting for a few years. I have had the fuel tank sitting with carburetor cleaner for a couple of days but it appears that the tank is not only loaded with black goo from old gas but it has quite a bit of rust. I cannot decide how to go about cleaning the rust and if I should install a liner product. I have been thinking about using vinegar to clean the rust and using one of the pour in liners. I have read a few different reviews and was just wanting some practical advice about what to use to remove the rust and should I line the tank. Here is a photo looking down into the tank.