Gas Door Freezes Shut

I noticed a few times now that after a snow storm or freezing rain the gas filler door doesn't open when you flip the lever under the dash. I've had to go and hit it with my mitten or glove to loosen the ice holdin git shut. Has anyone else experienced this? How have you cured it? A little paste wax rubbed on the parts or WD40 ect.? It hasn't happened to my wife who drives the car yet, but I'm waiting for the phone call one day soon.
 
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