I use Simple Green cleaner all the time i was reading the label it said that it would work as a carpet cleaner also . I tried it it works great I have a tap that i made so i have hot or warm water to my hose out side i use hot water to get the stuff loose scrub it real good and use shop vac to remove water it works great makes the carpet look like new.

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2000 blk xlt f150 sc 4x4 orp pkg 5.4 3.55 ls tow pkg , flowmaster BFG all terrians ko's (stupid ats went out of round with less than 4000 miles on them )air box mod, herculiner ,
sony 10 disc cd-player A.R.E. cap remote start

 

The best cleaner I have ever seen on carpet is Stanley Steamer spot remover. I bought it from them when they cleaned our house carpet. It costs about $15 per quart. I used it on a older car that had grease spots on the carpet for ten years. I tried everything else but very little rubbing with the SS liquid did the trick.

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Mine: '97F150,XLT,SC,4x4 ORP,4.6L,3.55LS,17" ORP wheels w/265/70/17,auto,6 CD,Towing package,alarm,Rhino grill guard w/PICCA lights,dual exhaust.

Wife: '99Explorer Limited,pearl white/tan leather,4.0L,4:10LS,CD,sunroof,towing pkg.,alarm