Patty:
I recommend a product called Folex sold by any number of stores in the U.S. and Canadian Tire here in Canada. This product was demonstrated to us by a person with a 36TK3 who had been using it for years.
Folex
www.folex.net is petroleum free and is non-toxic and even a non-irritant. Folex can be used on any fabric that can stand water. You can work the stuff into the carpet with your fingers and blot with paper towels or go whole-hog and use the neighbour's wet-vac. We travel with a "Little Green Machine" by Bissel in the belly of our beast because we had the same trouble with slideouts marking carpets in our previous trailer.