Sofa stinks of milk

[WestEast]

So DSD spilt milk on my fabric sofa this weekend without me knowing, the sofa now honks of gone off milk.
It really honks.
Is there a way to get rid of the smell without resorting to scrubbing the entire sofa? The cover doesn't come off and there aren't any cushion covers I can wash.
I don't know where about she spilt it either and I can't live with the smell much longer!
Any ideas?