It used to be extremely easy to rent wet vacuums and related equipment for cleaning a carpet. They seemed to be available everywhere, even in discount stores. Then, general retailers stopped offering this service and even sold fewer machines for the job. The good news is that carpet cleaner rentals are still available as a specialty service, if the seeker knows where to look. A website dedicated to cleaning services is a great place to start.
Find wet vacuums, solvents, and cleaning bases to solve just about any problem. Other products include foaming spot cleaners and carpet brushes. All this is available from a website that might advertise specific products directly as well as the directory for rental services. For most people, there is no need to buy an expensive wet vacuum because the service might only be needed once a year. If rental is a vastly better deal, it is only a matter of finding and comparing services.