I just discovered these Mr. Clean Magic Erasers take ink off my acrylic blocks after stamping! Woohoo! I tried an ink remover that I use to clean my clear stamps, but it did not remove all the ink from the blocks. Guess what? This little sponge does! They also work great on grout & appliances...if you are so inclined to do housework! They cost about $1 apiece. I tried Target's version of the Magic Eraser and they worked great too.
