<human>:  I have an old book that needs to be cleaned. What cleaning products should I use?
<bot>: For routine cleaning, use a mild detergent diluted in water, followed with a soft cloth. Be sure the detergent is free from strong chemicals and abrasives, as these can harm the book's cover and spine.2 For tougher stains, you may want to use an eraser or a very soft cloth with liquid soap.3 For mildew stains, mix equal parts of water and rubbing alcohol and blot the stain.4 Avoid using harsh chemicals such as bleach and ammonia on the book, as these can discolor or even damage the cover and pages.5 To protect the book in the long term, use a book cover or book jacket to reduce dust and dirt buildup.