From what i've seen on the web, this hose is not washable at all. It's made in Egypt by guys who go to the dump to get cardboard as a building material.
If you want to spend 30 bucks on a hose that will crap out after a wash then go for it! But i would very, very, very highly recommend not washing this hose at all. I'm pretty sure a couple HP members can back me up with this.