when my gas cap starts to get dirty, i will 'clean' it with wd-40- i spray
a bunch in the cylinder and around the turning parts below.  It worked
really well and kept it from freezing this past winter.

Matthew Pollard             http://www.uidaho.edu/~poll7356
Dept. of Chemistry               http://www.chem.uidaho.edu
University of Idaho                   http://www.uidaho.edu