What's the best way to get a smell out of curtains?

Hey all! My housemate has moved out, she's not western so her standards of hygiene were different.

Her curtains and bedding smells awful. Her bedding is going to a local cat sanctuary, I washed them on a 2 hour 60 degree wash with double detergent and they still smell.

Her curtains are washable polycotton, how can I get the smell out of them?