Mini Cooper R50 Subframe rust treatment

[@GlasWolf]

Being doing exactly the same on mine over the last few days. Ended up using a screwdriver to scrape most of the rust off, then finish with a wire brush. So many hard to get to little crevices, particularly the rear suspension arms. Taking off the wheels helped a bit, as well as the front wheel arch liners. Well done though - horrible job but needs to be done.