if it makes you feel better, the boots will collect mud anyways.
i understand your want to keep em looking good, after the buy-in price. but they do keep pretty clean for me! i take em off whenever im in the area and clean em up a lil bit, they look great! only damage is dings to the aluminum housing for the lower rod end, its mostly white! shafts are good and seal well. this is after 3 years of abuse (limit strapping off them so much as to rip sheet metal up top)