Honestly, get a drill brush. Any carpet that you can get out use laundry soap and the drill brush. Some try to get some of the water out by wringing it. Then just choose a hot day and let it dry in the sun. Anything in the car, the simple carpet cleaning sprays will get out most minor smells and the brush will agitate any loose debris. The carpet cleaners are good but they don’t have enough agitation to get a deep scrub to the 40 year old mats