Generally, couch cushions should not be washed in the washing machine for a number of reasons, such as the risk of ripping the fabric or messing up the foam. Removable cushion covers may be washed in the washing machine as long as the cleaning instructions say they are machine washable.
One way to wash couch cushions is with an upholstery or steam cleaner. Steam cleaners can help sanitize and deodorize couch cushions while also removing stains. Another way to wash couch cushions is by applying dry-cleaning solution to the cushions and gently blotting the fabric with a damp, white cloth. Before cleaning couch cushions, it is best to determine the fabric content of the cushions.