Ugh, I'm not sure how. I tried my good friend Google, and you're the first post to come up. Everything else was "how to get ink out of..." or similar, whether I typed in Magic Erase, Magic Eraser, melamine foam sponge...
I am so sorry. It sounds like a beast to deal with.
Trying for #3; FET 8/18 -- BFN. Leaving things up to chance for now... After three years, three IVFs, and two FETs, we finally have our miracle babIES!