Paul Mo Offline Upload & Sell: Off
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I am not sure about a fix, but to start with I would gently abrade (scotchbrite or similar) the corrosion, spray a small disposable cloth with WD-40, and apply a very fine film to the hotshoe.
Then I'd thoroughly wipe it off leaving the barest of coatings.
Then, I'd test my flash and exposures and keep the hotshoe maintained.
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