I washed a dry-clean only silk and cashmere sweater in the washing machine. With regular detergent. Not on the gentle cycle. And then I dried it in the dryer.
See, I got this sweater a few years ago from the Victoria's Secret Catalog, and frankly I am much too lazy to keep taking it to the freaking dry cleaner. So I was like, whatever, if it ruins it, at least I got a few good years of wear out of it. And I was going to hang dry it, but I forgot, so... it went through the dryer, too.
Oh, and it's completely fine. Like, good as new. Seriously. Which is making me think that this whole dry-cleaning thing is a scam. Because shouldn't it have been ruined? Well, it's not. That is all.