one of my dogs peed on my couch

Any ideas how to get it out of the cushions? I took off the covers and washed them in the washer, but of course the dog peed in the space between two cushions so it soaked the two cushions and the couch underneath. I squeezed the cushions with a towel, sprayed it with pet stuff for urine and squeezed them again and then sprayed them again, but honestly I'm considering buying new foam, but that leaves the couch, it is soaked through to the fabric underneath the couch. I used a towel to soak up as much as I could, sprayed it, used the another towel, sprayed it again, and put baking soda on it, which I'll vaacuum at some point later today.

Plus, I have three dogs and don't know which one did it. The likely culprit is the newest one but we've had him since October and he's only peed in the house 2 or3 times. The little black one peed by the door when she was sick, and the oldest one hasn't peed in the house since she was a puppy (she's 6). I am worried one of them is sick or something but don't know which one it was. BAH.

I don't. But I'll look into that.

They had one at Petsmart - I went in to buy more enzymatic cleaner yesterday.
To give you an idea how few accidents my dogs have, I just used the last of the cleaner I bought when Leela was a puppy in 2007.

So I sprayed the couch and cushions again last night. We'll see how things are this evening. But the dogs have lost couch privileges unless we're with them. We blocked them off with the coffee table and a baby gate.