Yes North African..it was actually Air Algerie who had taken eco tankage into GVA and onto ZRH. Our ground crew had checked but not checked and there was a layer of clear ice on the wings which my skipper spotted. Ex Luftwaffe strarfighter...incredibly talented the whole bunch.
The crew went all the way to the threshold of 23, lined up and put on loads of power which saw my skipper go white but they were just speeding up the process of getting back to the ramp. It took two full goes to clear the ice.
Our DC9s had tell tales added to aid clear ice detection as it is extremely difficult to see.
The ANC case was also ex Luftwaffe...but everyone could see an inch or so of dry snow on the wing...quite sure that the local FAA tolerated the practice.
WRT to dents..her indoors had five hours getting drunk in Nimes after a frog loader drove into FR cargo hold frame...engineer decided that he couldn't inspect the internals so they flew down another 737.
And we had a big airways "senior first officer" tell us all how he was a clever boy and had discovered a dent at LHR on a 74 with the paint peeling off...the insides weren't much better with threadbare carpets and the entertainment system not working...haven't been back since.