From the BBC: Nasa rover breaks down on Mars

You don't have to be as old as me to know that the moment they discovered moisture on Mars, Rover were stumped - they've always had a problem with damp.
You do have to be as old as me to remember when the standard solution to keeping a mini/1100/Princess and derivatives was to cut the ends off the fingers of a rubber washing up glove and fit it over the distributor!