Twice a year. Upholstery needs to be cleaned regularly in order to remove dirt, dust, and other allergens that can cause problems for people with allergies or asthma. Upholstery can also be treated with a protectant that will help keep it looking new for longer. You should clean your upholstery twice a year for best results.
You should clean your upholstery as often as needed, depending on the material. Leather upholstery can be cleaned with a leather cleaner, while fabric upholstery should be vacuumed and/or dusted regularly. Spills should be cleaned immediately with a cloth dampened in warm water and a mild detergent.