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Haven't had my own science tables in a classroom yet, but I do remember kids scratching initials and whatever else into them once they realized it would show up, when I was in school.
In a quick search I found this link: http://www.kay-twelve.com/blog/a-guide-to-cleaning-science-tables/
which seems like it should work, and the home page looks like a promising resource for fixing other teaching-furniture issues!
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