I get staz-on or dark inks all over my blocks ALL the time. One day I was frustrated because I couldn't see thru the part I needed. So I used a bit of Staz-on cleaner and it didn't really doanything - I think it was too dried on. I was by the kitchen sink and grabbed the Mr. Clean scrubber and POOF! allof the ink rubbed right off. I now use it all the time and it makes them back to sparkly new!
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