Can the cushion cover be removed? Yes. You can unzip, remove the cushion insert, and machine wash the cover. Is the cushion water-resistant? Yes, it is water-resistant but not waterproof. Does this rattan need seasonal treatment? No. This all-weather wicker is synthetic, UV-rated for 1500 hours, and fade-resistant for up to 3 years. Simply clean with a soft cloth, mild soap, and water to remove dirt and pollen.