Keeping books dust-free requires a little ingenuity. Boston Public Library uses a clever solution: a “mini car wash for books” that cleans around twelve books a minute.

On Twitter, the library shared a video of its portable, dust-busting machine, Depulvera, washing closed stack books that don’t have dust jackets. “We do not use this machine on our rare books,” Boston Public Library clarified in a tweet, “just the books from our closed stacks.” (Rare books require a bit more TLC.)

The book-washing machine industry is awash with options, according to Library Journal, because dust presents a danger to books and other materials.

“Dust,” Denice Rovira Hazlett writes, “absorbs moisture, increases acid hydrolysis, and causes a quicker breakdown of valuable resources.” Thankfully, book-washing machines that contain dedusting vacuums and deacidification sprays can “help neutralize the acids in paper and create an alkaline buffer by increasing the pH of acidic paper,” thus extending their lives for our enjoyment.

But not every book-washing machine is created equal: different book-washing systems target different issues related to the preservation of books. Read about five such products at Library Journal, which range in appearance—some look less like mini carwashes and more like odd worktables or vacuum cleaners.

Video credit: Boston Public Library.