Sometimes it's better to walk..........although many people are offering advice and encouragement, you need more than that. to get a viable return. from the average rug clean, never mind the time consuming method discussed here.
You will all have the regular experience of quoting for a job and the client suddenly remembers about a little rug..............sure as hell, is hot, you answer, "no problem" and add on a lower price than you should...............well I do and so do some of you.........then you always take longer than you should and curse yourself, again !
Per square foot, rugs take a lot more time and effort than fitted carpets and you either have to charge, in most cases, half the replacement cost, or treat it like a "supermarket loss leader"
Expensive rugs..................completely different story.