I'm sure all of you here on this forum are more intelligent than myself and thus have not tried to write with a dry erase marker on your Wii -- but sadly, in a fit of joy, I got over excited and tried such a thing (having heard on the internet that it was possible -- and gosh, everything you read on the internet is TRUE, right???). FYI, IT DOESN'T WORK.
I wrote with a blue dry erase marker and seconds later, tried to erase it with my finger just to be sure and it was INSTANTLY set. I was like holy crap.
Now, if I scrub really hard it does come off (although there are small stains of blue). My friend also suggested I try nail polish remover, and I also have goof off at home I want to try too.
Anyway, just a heads up to all you wii fans out there