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I just used cotton buds and water. Wet one end of the bud and rub any small dirty area then go back over the area with the dry end. You'll see results within seconds.
You can use a fine wet cloth but you don't want the paper getting too wet. We just want to remove surface dirt.
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British Quad which has been folded just the right amount of times and shoved under one of the corners to stop the place from wobbling.