I will do that for sure. I did spray down the incubator with hydrogen peroxide as well.
Now that they were washed, do you guys think I should mist and cool them?
Have you read Pete's guide to hatching goose eggs? It's in the Stickies section in the goose forum, and it's very good. I definitely recommend reading it.
I always wash the muck off my goose eggs, and I've always misted and cooled them even when doing that. I've never washed them with anything other than water, though.