North Africa was cleared up by the allies and the work continued into the late 50's / early 60's I seem to recall having read once.
I spent a bit of time in the Libyan desert, Tripoli, Benghazi and Tobruk in the 1980's. Tobruk still had ****e lying around on some parts of the coast as di Benghazi to a lesser extent. There are lots of shipwrecks beached on the coast and I once kicked what I thought to be a tin canwhile walking along a beach 25km South of Benghastly only to discover that it was a 3" shell with fuse still attached. The correct steps were taken; large and fast ones in the direction of away!
A pal of mine used to drive into the deep desert to mark positions for the drilling companies to drill the oil wells. He found all sorts of bits and bobs including a single seater aeroplane with the pilot's remains in it. This was duly reported to the appropriate authority who organised the recovery of the remains.