How To Clean A Mattress. Use a wide brush attachment to vacuum the top of the mattress. The first step to cleaning your mattress is vacuuming.

The longer you can leave baking soda on the mattress the better it will work. This will remove mites dust dead skin hair and other debris from the mattress. This product is usually enough to remove the stains on mattresses.
Baking soda will break down acid and absorb any remaining moisture or odor.
Use the long upholstery nozzle to get into cracks to vacuum edges and piping and to clean the sides and corners. As the mattress sits with the baking soda. Use the long upholstery nozzle to get into cracks to vacuum edges and piping and to clean the sides and corners. Alternatively for specific stains it is better to use off the shelf cleaning products.