If you are putting it away for the winter (and even if not) it's worth spraying waxoil or similar around the hidden edges of the wings and behind the wheel arch liner where it screws to the end of the sill, it's well worth giving the subframes a coating as well. Although I have no experience of either using it or its effectiveness Lanoguard looks very promising in one video that I have seen. Using a trigger type sprayer it produced a mist of wax. The £467 TF that I bought is totally free of any rust where the black wax coating was applied, shame that they didn't do under the front wings.