There was a guest in my house who used my gas fireplace and didn't know how to open the chimney. These sponges are slowly but surely removing soot from my walls and doors. Nothing else I've used has worked at all. You have to press hard, but if you rub the sponge it will start to deteriorate. This is probably why the packaging says to rub in parallel lines, not rub. I was surprised that they can be washed and reused. I just wish I didn't have to push so hard.
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