The keycap puller was the thing that made me finally decide to order, so its a bit more of a disappointment to me, guess ill be sticking with mr. wanna-scratch for now^^.
Here is a (pretty bad) picture of the cap, thanks to the flash you can see that its is actually part of the cap, not just on the surface, there is no way for me to remove the stain without ruining the cap.
And yes, this cap is from the row behind the spacebar so it is quite visible.