Got old documents, books, or artwork that need a gentle clean? This FACTIS cleaning bag is a pro secret for careful restoration. It's a simple stretch cotton sachet filled with 120 grams of super fine gum powder (think super soft rubber dust). To use it, just gently squeeze and shake the bag over the surface — a light layer of powder will come out. Then, use a soft brush (not included) to work it in with little circular motions. The powder lifts away dirt, dust, and even some stains without damaging delicate paper or artwork. When you're done, just brush or vacuum the powder off. It's a totally dry process, no liquids or chemicals. Perfect for archivists, book lovers, artists, or anyone who wants to carefully clean something precious. A little bag that does a big, gentle job.