All Saints Zeeda dress: washable?

[angathol]

First-time poster with a mildly embarrassing question. I know a handful of you own River's DOTM dress, and from all these River-related posts, you seem like a perfectly friendly and helpful bunch, so I knew this would be the best place to ask. :)

I have somehow ended up with a small but mild stain on my dress in a visible area (near the neckline but mid-breast, which is admittedly a pretty awkward place for a stain). I dabbed it a little with water and it did tone the mark down, but now there's a slight water mark in that area. I know the washing instructions are "dry clean only," but has anyone tried washing it on a delicate cycle or handwashing it, and if so, what were the results?

Thanks in advance!