Most people don’t realize that it’s unhealthy to sleep on a mattress infested with millions of DUST MITES and muck. Mattresses should be cleaned every year to reduce the colonies of dust mites residing deep within your mattress. Single mattresses have been found to contain up to 200 grams of dust (mixture of organic & inorganic materials) as well as bacteria, viruses and fungal spores – all of which can cause ill-affects and allergies in humans.