Hey, cuffs
If the cushion covers can unzip to remove them, do so.
Be sure to zip them closed before putting them into the washer.
Air dry, or replace on cushion while damp if you're afraid they'll shrink.
Don't put any cushion itself through the washer or dryer.
If the covers can't be removed, then steam cleaning is best
And/or use a mild upholstery detergent.
Dry with a blow dryer on low heat if you're worried about mildew.
If there's unwanted smells, lightly brush on some baking soda, then
vacuum it off.
These are merely suggestions. I'm not responsible for any damages.