Soaking indeed can help the old ink come off, and at any rate will not do any harm. I use a piece of loofah sponge for daily cleaning. It’s coarse enough to scrub off leftover ink, yet does not hurt the stone.
I also have the mud block from Inkston. The quality is all right, I haven’t met with any nasty surprises (coarse sand). I find that it can be used to “reopen” the surface of the stone when it has lost its cutting ability, but normally you don’t want to do this all the time. By the way, I don’t exactly see why you could not use it on a round stone – you can always make a paste of the mud with water and polish with it.
If the stone is scratched or otherwise damaged, you can polish the surface using sandpaper, gauge depending on type of stone and desired result. The problem with sandpaper is that it wears the soft and hard parts of the stone equally, leaving a smooth surface with no cutting ability whatsoever. Grinding again with the mud block can help. However scary it sounds, you can even try an abrasive kitchen cleaner that contains milled calcium carbonate. Calcium carbonate is 3 on the Mohs scale, which will leave intact the hard components of the inkstone. The kind used in kitchen products can be a little coarse, though.
Some new inkstones, usually low or mid-range ones, are sold waxed or just plain unfinished, in which case they too will benefit from sandpaper treatment. #HowToCleanInkstone
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