Yeah me too, i've heard that this machine does a fantastic job in getting up set-in stains and they're a time saver! It's pretty expensive though I don't know if it's worth it or not ...

Could you rent a Rug Doctor and use the stair/upholstery attachment? I was just looking at another thread on this forum where several people had favorite cleaners to use.

My local self serve car washes have vacuum cleaners, coin operated.

If there's moisture, cover the area with bicarb. soda, for a while. Then clean it with vinegar & water. There are various ratios recommended for the mix, try what works for you. 1:2 or whatever. Spray it on, scrub, wipe with water. Repeat it until the marks and smell are gone.

Just looked this up at my local Home Depotcarpet cleaner