Why rug & carpets should be cleaned?

Twenty years of research and everyday experience, showed that rugs & carpets should be cleaned. Dust, microorganisms and pollution tend to be deposited on flat surfaces, such as furniture, the floor, or the carpets.
Vacuum cleaners suck only a small part of dust and particles. Rugs & carpets have the ability to store microorganisms in depth, and imprison stains, which cannot be removed without thorough cleaning.
Therefore, it is not an overstatement to say that rugs & carpets can be pollution sources.