I just wash my jeans like all my other clothes. I've got black jeans from like 4 years ago that still fit, and they haven't faded much at all.
I do wash them on cold or cold/warm though. Yall actin like Martha Stewart and shit, "now fold them inside out, put the water on cold, only put in one pair of jeans, use a quarter cup of detergent, and then wash for an hour. when done, remove immediately, and hang dry."
I mean really, they're just fuckin jeans, lol...