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with pumice or infusorial earth. there are soaps made especially for this purpose, similar to those for use on woodwork, etc., in which infusorial earth or similar matter is incorporated. to remove nitric-acid stains.
--dip a soft brush in alcohol to which a few drops of ammonia water has been added, and with it go over the surface. do not rub--at least, not roughly, or harshly. in the course of five minutes the dirt will have become soft, and easy of removal. then go over the surface again gently with the same or...
https://niir.org/books/book/selected-formulary-book-on-cosmetics-drugs-cleaners-soaps-detergents-2nd-revised-edition/isbn-9789381039731/zb,,18bc3,a,0,0,a/index.html