Sažetak Natural aging processes cause damages and lots on archival materials. Thus the visibility of text is decreased, paper is additionally damaged, and therefore should be cleaned. Dry and wet treatment is used for cleaning. Dry treatment precedes wet treatment and it is done by rubber, scalpel, soft paint brush, cotton wool and heat. In most cases a water is used for wet treatment, as well as different dissolvers, or method of whitening is used. Correct choice of disolver which is completely or quickly evaporable is very important. The whitening is used if dissolvers are not giving desired results. It is important to wash out of paper the remains of used device and to execute neutralisation to prevent damage of a document.