I've never rented a rug shampoo machine - always had it done by a service
who's done good work for me over the years. I'm wondering if anyone's
rented, and then thought "Phuque - I really should've just called someone".
Cost isn't the major issue here - I'm looking for maximum results. The
company I've used before utilizes some sort of carbonated/chemical stuff
that leaves virtually no odor, so the substance doesn't enter into this,
either.

Any thoughts on the rental units? What to avoid?