Ds fell asleep on the sofa one night and wet himself. It's soaked through the large base cushion and into the base. I've washed the cover but what can I do to the cushion? It's big and heavy and it's not hot sunny weather where I could stick it outside, hose it down and leave to dry. It's too big to go in even a laundrette machine. I can use the carpet cleaner on the base or just hot soapy water and a cloth.