Steering Wheel Gunk:You know what I'm talking about. That black nasty stuff that comes off on your hands while driving the rover in the humid months (those of you in Arizona probably don't know what I taking about -- sorry).
Apparently Rover steering wheels were once painted with black paint. It wears off and the core material is very susceptible to moisture and breaks down.
Solutions:
1. Only drive when its hot and dry out. (Sorry I couldn't resist.)
2. Steering wheel covers! The cool rally kind from Grand Auto. Tan maybe?
3. Paint the steeling wheel.
4. Live with it -- They still drive don't they?