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@deleted
Dunno if has already being said...
-spray 3-in-one or better PlusGas and leave overnight
-put the bb remover (is the same as Campy cassette lockring, but with a bigger hole) and keep it pressed with a crank bolt and one or two big washers, tight firm
-put the extractor in a vice, and turn: towards the front wheel in both sides, if is BSA thread ;)
If fails, it's easy anyway: Miche bb's need just one side to go (either L or R) and the BB core slides off. If the notches for the extractor get shagged, you can always file down two or four notches and use a Freewheel extractor, in the was as above.
Or, as the last remedy, saw the cups in two points (clearly, the bb core has to be out!) and get it off with big pliers