We know: The most entertaining do-it-yourself car wash, and certainly the cheapest, is in one of Denver's city parks, where you can pull up to the side of the road and pretend to polish the chrome while you're really watching all those hard bodies run by. But if the pressure's on for a fast cleanup, point your dirty car in the direction of this Hi-Performance station. This do-it-yourself car wash may look like nothing special -- in fact, it looks abandoned, and doesn't have any phone number that we could find -- but that just means there's never a line. And this Hi-Performance is high on the most critical component for a good cleaning: very hot water, and lots of it. Drop in a quarter and it just keeps coming --long after other car washes would have dried up. Drought? What drought?