I spent quite a bit of time researching the possibilities and in the end, I went with hand washing in Woolite!

And when I put the layout into the bucket, the water immediately turned green. And after I aggitated the layout, the white imprint had a green tinge to it. All-in-all, I figured it was ruined!

But after letting it air dry, the only loss was the imprint on the reverse side. And while it did shrink just a little bit, I was able to re-stretch it to cover the table.

Jim