Una,
I had the same thing on my fuel door earlier this week. It appeared the day after the snow storm. I had a white chalky substance around the lock cylinder and in the key hole. I thought it was the snow or salt reacting with whatever type of metal the lock cylinder was made out of. I took some Mothers Chrome Polish and cleaned it up as soon as I saw it. It came off nicely.Whether the fuel door is powder coated or chromed, I don't believe the inside of the lock cylinder has any type of coating or chroming and therefore is susceptible to oxidation.
2003 Yellow H2, Lux Series, Air Suspension, Front Brush Guard, Rear Tail Lamp Guards, Helo Maxx 8 Chrome Rims, MC2 Chrome Billet Locking Fuel Door, MC2 Chrome Hood Handles, MC2 Chrome Hood Latches, Chrome Billet Hummer Logo Hitch Step
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