Foul smell from the Seats

Hi guys

I've tried cleaning the car seats of my Mitsubishi Magna seems like nothing is working.
I cleaned the car seats with degreaser and then used vaccum and let it dry. Still the foam stinks.

I used carpet de-odouriser too

Any solutions?
Or I am going to wrecker this weekend and getting all the seats from there and install in this car.

Let me know if you have any suggestion

__________________
I am not Good I am not bad!

umm well i have heard that bicarbonate and soda solution works pretty good..you just mix about 300ml of it with a teaspoon of the stuff...rub it in the upholstery, and hose of the white salt when it dries up...!