Mine get like this every time I serve a red sauce, but it actually fades away on it's own in a day or two. I just give them a good scrub with soap and hot water as usual and then it goes away as I repeat the washings after snacks and meals. Don't worry!
I don't let the Mr Clean erasers come into the house -- I have heard a lot of bad press about them being full of carcinogens. Maybe they have changed over time?
I find that some dishsoap mixed with water often gets the tomato stains out.
Baking soda with peroxide and make a paste - whitens almost everything
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