Mattress Topper for 6ft Bed (Worthing BN13)

Super King Size 4” deep white mattress topper. Polyester filled with cotton cover and elastic corner straps. Used for approx 6 months on zip-together 3ft mattresses bed only used by a 7 year old so not much wear. No stains. It’s too big to go in a normal washing machine but I understand there are commercial machines available at Morrisons in Worthing.