Once again I lucked out with a free shower at the Flying J in Ehrenberg AZ. If the tall guy with glasses and light brown hair and beard waits on you, maybe he'll give you a free shower, too. Otherwise, it's $12 without the pro driver rewards card.
One of the joys of doing laundry in an arid climate is clothes (especially jeans and towels) dry quickly. That means fewer coins in the dryers or time hanging on a line. It means getting to La Paloma Cafe sooner for one of their burritos.