It is best to remove immediately superficial dirt and stains with a cloth or a soft brush, possibly with some lukewarm water and detergent.
If you wash the cushions thoroughly at the end of the season, keep the following recommendations in mind:
Washable at 40 degrees in the washing machine.
Hand wash (less than 40 degrees), rinse thoroughly.
Dry in the open air.
Do not iron.
Tip: Always wash your covers with the zipper closed and the right side out (not inside out).