This section is from the "Henley's Twentieth Century Formulas Recipes Processes" encyclopedia, by Norman W. Henley and others.
To remove oil stains from leather, dab the spot carefully with spirits of sal ammoniac, and after allowing it to act for a while, wash with clean water. This treatment may have to be repeated a few times, taking care, however, not to injure the color of the leather. Sometimes the spot may be removed very simply by spreading the place rather thickly with butter and letting this act for a few hours. Next scrape off the butter with the point of a knife, and rinse the stain with soap and lukewarm water.
To remove all kinds of greasy materials from glass, and to leave the latter bright and clean, use a paste made of benzine and burnt magnesia of such consistence that when the mass is pressed between the fingers a drop of benzine will exude. With this mixture and a wad of cotton, go over the entire surface of the glass, rubbing it well. One rubbing is usually sufficient. After drying, any of the substance left in the corners, etc., is easily removed by brushing with a suitable brush. The same preparation is very useful for cleaning mirrors and removing grease stains from books, papers, etc.
White spots on polished tables are removed in the following manner: Coat the spot with oil and pour on a rag a few drops of " mixtura balsamica oleosa," which can be bought in every drug store, and rub on the spot, which will disappear immediately.
Place soapstone, fine meerschaum shavings, amianthus, or powdered magnesia on the spot, and, if necessary, lay on white filtering paper, saturating it with peroxide of hydrogen. Allow this to act for a few hours, and remove the application with a brush. If necessary, repeat the operation. In this mariner black coffee spots were removed from a valuable diagram without erasure by knife or rubber.