High-traffic areas may need to be cleaned every six months, whilst less frequented areas may not need cleaning for 18 months. However, if you have allergies, pets, children or exposure to cigarette smoke, cleaning may need to happen on a custom schedule.High-traffic areas may need to be cleaned every six months, whilst less frequented areas may not need cleaning for 18 months. However, if you have allergies, pets, children or exposure to cigarette smoke, cleaning may need to happen on a custom schedule.