This may seem a little crazy, but according to Apartment Therapy you're actually better off freezing your jeans to clean them as it keeps the raw denim intact.
According to Apartment Therapy, this really does work. (See "proof" in the video above.) Basically you just need to brush your jeans off, fold them, put them in a plastic bag, push all the air out, and then toss that bag in the freezer. The cold temperature effectively kills the bacteria you picked up when wearing them, keeping your jeans feeling clean. Obviously this isn't going to get a stain out, so you're going to at least need to spot clean if you get visible dirt on your fancy jeans, but if they're just feeling dirty from wear they might just need a good freeze in a plastic bag.
How to Freeze Your Jeans [Apartment Therapy]