What do you recommend to clean stained car seats?

I have stains on my car seats. I've tried vinegar and bicarbonate soda, as well as vanish, but they make the seats worse. Can you recommend another option?

What should I use to get vomit stains out of my car upholstery?

My son vomited on the interior plastic door and dashboard, he then aimed for the window which was open, and managed to get the interior door, inside the window and the external of the car. Unfortunately...