I have a few crossbred duck eggs and crossbred goose eggs if anybody is interested. I ask should have tutor eggs as well (I'm swimming in eggs right now)
I also have pekin eggs... there may be a cross with a rouen potentially, but the rouen generally doesn't mate the pekin girl.
I do wash my duck eggs, but I've never gotten anything but 100% hatchability from them, even washed.