All carpet and furniture manufactures recommend that your carpets and upholstery should be cleaned every one to two years, depending on the kind of use they are subjected to. When you vacuum your carpets, this helps remove dust, crumbs, dirt, and other debris. But a lot of the time there are very small dirt particles that work their way deep down into the fibres and fabrics, and it is this type of dirt that acts like sandpaper and grates against the fibres, which in time wears the fibres away leaving the carpet looking dull and dark. Eventually they become very visible, so this why we also recommend regular professional carpet and upholstery cleaning. Regular cleaning is still far more cost effective than replacing it no matter how inexpensive the items were in the first place.