For all those who are completely lost here, I do believe what is being asked is a steam cleaner seen on infomercials.
It doesn't clean carpet, but what it is designed to do is be a high-pressure steam jet that is supposed to clean: mildew off tile, rust stains in the bathtub, hard water stains on faucets, dirt off walls, etc. etc. etc.
Its comes with a reservoir, connected to a small vacuum hose, where the steam travels out of. Usually has a trigger switch, and when depressed, opens the valve and steam is released at the end of the nossle, to attack the dirt and grime of whatever you want to clean.
An example of what it is (DISCLAIMER: Do Not blame me if you check this page out and decide to buy it and then realize its a piece of junk that is never needed in the first place and your life becomes a living hell with no end in site. Tis ain't my fault. K?) here