Yes, I do this about twice a year. I go to a laundromat and use their biggest machine, along with some special down laundry detergent. I think it's ok AS LONG AS you dry it right away and thoroughly, hence why I use the commercial driers rather than the one I have at home.

It has to be totally dry or it'll permanently develop a bad smell. I wash my pillows this way too.

There is a really awesome cuban bistro next to the laundromat, so I time it so that I can have drinks with friends while my stuff is in the washer/dryer.