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I have an old Rainbow brand dry/wet vacuum that my mom got at a yard sale, similar to this model. My family grew up with this kind of vacuum at home, and it was useful not only for typical carpet sweeping, but also for cleaning up wet messes.

This type of vacuum has a water-filled basin in the bottom to catch whatever gets sucked up.

My question is, can I use a cleaning solution plus this vacuum to shampoo my carpets similar to a Rug Doctor?

EDIT: More information: I'm hoping to clean our apartment's carpet of the dirt build-up from in front of where our couch was before we re-arranged the living room. There is a noticeably darker strip where our feet would sit. I don't think there are any tough stains that need extreme heat to break up, just dirt and a few water-soluble spills here and there.

Our apartment is tiny and only has three carpeted rooms, and only the living room gets regular shoe traffic, so it's the only room I'm thinking of doing this in.

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Theoretically it ought to be possible to combine a water-heating-and-spraying device with a shop vac to wind up with an equivalent of those machines. But I don't know of such an accessory device, and given safety concerns I wouldn't want to try homebrewing one. Depending on WHY you're shampooing the carpets, wet mop and shop vac might do the job... or a house-style vacuum head with a beater brush. –  keshlam Jun 17 at 17:12

3 Answers 3

The Rug Doctor type of carpet cleaners heat up a relatively large amount of water to a very hot temperature, and spray it fairly evenly into the carpet along with the cleaning solution, then vacuum it back out. Although they are often referred to as "steam cleaners", the rental ones I have used don't actually produce steam, but very hot water (below the boiling point).

A wet vacuum like you indicate will do the last portion of vacuuming up the solution, but the missing piece will be the heating and spraying of the solution. I have definitely had carpet stains that no amount of spray-on cleaner (like "Resolve" spray) would remove, but the rental cleaner would. I believe it is the super hot water that makes the big difference.

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Having professionally cleaned carpet in the past, I have yet to see anything as effective as truck mounted machine. That being said, I would go the way you're thinking instead of renting or buying something like this.

As another answer stated, with a truck mounted machine, the water gets very hot, which is paramount for removing tough stains. If you just wanted merely to scrub the carpet by hand or some other means and vacuum up with the shop vac, that's certainly doable, provided you have the proper wet filters, and adequate power (suction) from your vac. I would do this for tough spots, even 12'x 12' rugs, but anything larger my efforts would outweigh the cost of paying for a truck mounted cleaner with an experienced person to do it.

That being said, I suppose a decent cleaner can be made at home with the proper materials. First, you'd need really hot water & soap, pressurized together. So, for that, a pressurized power washer like this should suffice. It would need to be able to take special detergent as well, I know that some power washers only handle 'approved' soaps.

You'll now need something with a lot of suction. Your shop vac may be up to the task, only you will know for certain. One thing I'll add to that is make sure your vac either has a big tank so you won't have to stop every 5 minutes to empty it, or you just open the outlet (if possible) and drain it out without it building up.

For brownie points, try fastening them together to create a contraption that looks like this

enter image description here

You got a trigger to control soap/water flow, with the outlet behind the vacuum head, and fastened into single wand for control.

Update

For a small strip such as in front of the couch, I would scrub, vac, repeat, maybe an hour tops.

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While useful information, I think this might be overkill for what I'm hoping to do. –  Martin Carney Jun 17 at 17:53
    
@MartinCarney the trick is using very hot pressurized water, and having a strong enough suction to pull it back out the carpet, otherwise it will take forever to try, and still be slightly dirty. If you wanted to go all in/whole house, the wand certainly makes it easier ;) –  BigHomie Jun 17 at 17:55
    
@MartinCarney updated. –  BigHomie Jun 17 at 17:58

I've used a shop vac and Resolve for spots, but it would be impractical for anything larger.

One thing that would be missing is the high-pressure water spray. I don't know how much of a difference that actually makes.

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