Just out of interest.
How would you value a carpet cleaning business anyway? has anyone ever sold one? I suppose you'd not be reading this is you have! 
I think you could get a good price if you have a good turnover/profit, are established the local area and are able to transfer the skills/running of the business over to the new owner 3 months free training for example.
Would be worth a lot more than just the value of the kit and van.
Helps if you had a contract or two in place.
I did!
....And I'm still reading this forum
There are lots of ways of valuing a business. I sold mine as several times the annual turnover.
I sold it to my co-worker of 8 years standing, so he knew exactly what the business was capable of and had the advantage of perusing multiple years of Audited Accounts. He'd also contributed to a lot of the success of the business.
Now he is the "boss" and I am the co-worker. He picks me up in the morning, we clean during the day then he drops me off at night and goes home to do his admin. Oh, and he pays me a good wage as well. Not a bad life
I'll do this for a maximum of 5 years (already completed 1) and then I shall definitely be out.
Rog