How to preserve rare books of ancient books?

Everyone who loves books knows that some precious rare books of ancient books, if stained with various stains, will greatly affect the value of books. Therefore, different decontamination methods should be adopted for different stains: mildew spot removal. Dip a cotton ball in ammonia water or alum water, gently wipe the mildew spots on the pages, and blot them with absorbent paper after cleaning; You can also rinse the thick juice with water and potassium permanganate, apply the thick juice to the mildew spot with a brush, apply it with oxalic acid water after five or six minutes, and gently wipe it with a brush, so that the mildew spot can be removed several times, and finally wipe it with a cotton ball dipped in water. Remove ink stains. Put a piece of absorbent paper under the page stained with ink stains or handwriting, then soak the stains with 20% hydrogen peroxide solution or potassium permanganate solution, then put a piece of absorbent paper on the page and press a heavy object. After drying, the ink traces will disappear. If brown spots are left when using potassium permanganate solution, they can be removed by oxalic acid or citric acid solution. If there is only some handwriting on the page, you can also draw it in a faded spirit. Remove dirty fingerprints. Wipe off the fingerprints with soap first, then wipe off the traces of soap with a wet cloth, and finally draw lines on the pages with absorbent paper to absorb water; You can also gently wipe the cotton ball with washing powder or detergent mixed with warm water, then scrub it with clear water, and finally absorb the water. Remove oil stains. Put a piece of absorbent paper on the oil stain and iron it gently several times to absorb the oil stain; You can also gently wipe it with a cotton ball dipped in a little gasoline or alcohol. Remove stains from flies and mosquitoes. Dip a cotton ball in vinegar or alcohol and gently wipe the feces of flies and mosquito stains until the stains are removed. For other common stains on books, as long as you carefully wipe them with soap, then gently wipe them with a clean wet cloth, and then line the pages with absorbent paper to absorb water, you can basically get the effect of the whole old as new.