Plenty have had problems under the plastic arch liners and sill covers. I'm at the stage where, I spray WD40 in between the liners once a month (you can just squeeze the little red plastic straw thingy WD40 cans have in there) and more frequently in salty, wintry conditions.
I also caught my rear exhaust hanger area in time, but imo it needs regular attention. The fuel tank filler pipe bracket where it joins the tank is another piece that by now is likely to be rancid. I've coated mine in Jenolite and Waxoyl and didn't meddle with it. This Winter am Waxoyling the rear end on mine again and will likely do so at the end of each Summer going forward.
The importance of regular pressure washing under arches, around sills and back end cannot be over-stressed. Even if it means blowing off any loose Waxoyl - that was likely hiding something nasty anyway. Just my sixpence...
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