I haven't heard of a dress that will go in the washing machine because most wedding dresses have lots of little details that could be ruined from the swooshing of the washer....however I was reading about a TTD shoot on here recently and the photographer and a number of brides said that they had their dresses cleaned after they were in mud, water etc and they came out great....even better some of them got a killer deal on it while they were at their destination and paid way less than you would normally pay to have a wedding dress cleaned. I know it isn't the exact answer you are looking for but thought I would pipe in with what little I know!! Happy Planning!!