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Not an expert on paste grit's, but if the new paste is coarser then just get off as much of the old as you can, then the new will be able to go on. If it was the other way around there would be an...

I've cleaned the linen on mine by rubbing in a bar of soap & scraping it off. I used a steel rule, so there was no chance of cutting it. I just kept repeating the process & it got progressively...