Smudge.
I think you will find that Albert was not the only one suffering from corrosion. The Nimrod also had a big problem with wing corrosion and many manhours were expended trying to eliminate what effectively was eating metal from the inside and by the time it was seen,on the surface, it was pretty bad.The Lockheed P3 Orion, ISTR, had similar corrosion problems too.
If memory serves me; It was the method of construction of the wings which caused the bother. The corrosion had a particular name but my grey matter refuses to retrieve it.