
I don't know what I did wrong but they didn't work at all. Not even a little bit. I was trying to get the last of the black smoke out of our chimney. It wasn't much, but enough to cause discoloration. No matter how I cleaned (as instructed in the instructions), nothing happened. My husband even tried it, but to no avail. We landed on a magical Mr Clean eraser and he removed it with no difficulty. We didn't even have to scrub vigorously. Wiped right away.

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