I most definitely would not use sandpaper of any type.
If you can get coconut husk, use that.
For the brush on method you only use a very small amount of lime juice, maybe an egg cup full and a tiny quantity of arsenic, maybe enough to cover a fingernail.You let it stand for maybe half hour or so, just long enough to let any floating particles go to the bottom.
There is a complete set of instructions on how to do the job buried here somewhere. I wrote it, but I've got no idea where it is. That spells it out fully.
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