Best cleaner for fabric upholestery in car..

My car has fabric interior. What is the best cleanser to get stains out. I have kids and I let them sometimes eat in the car. Sometimes there are little mishaps. I keep it washed and vacuumed and the car dealership gave me this car cleaning kit. But I am about to run out of the stuff. Are their any cheaper alternatives. Also, what about getting the inside steam cleaned sometimes. I have a simple 2010 Hyundai Elantra and I take pride in it.