Most people don't realize that there's a proper scientific process to cleaning carpets. A full commercial carpet cleaningstarts with a precleaning inspection. This is where they walk around, and look closely at every part of your carpeting. Through this process, they learn what material exactly your carpeting is, and they identify what places actually need extra cleaning. Of course, they need to move all the furniture in the room to make sure that they actually get a good look at everything. All of this is completely mandatory.
And then, starts the actual cleaning. A thorough commercial carpet cleaning service will follow all of these steps. It starts with vacuuming with a powerful heavy-duty vacuum cleaner that takes out all the sand and dust, and other particulate matter. Most people don't feel this is really an important part of the process since they do their vacuuming all the time. Domestic vacuum cleaners hardly remove dry soil the way an industrial vacuum cleaner can. Since about 80% of all the filth in carpeting comes from dry particulate matter, the more time they spend on the vacuuming, the better.
The wet cleaning process begins first with a thorough preconditioning step. This is where they go over the entire carpeted area with a preconditioning solution gets in and loosens the dirt up before the real cleaning begins. You could consider this step kind of analogous to how you soak clothing in a washing machine so as to loosen the dirt up first.
While it soaks, they go over the carpeting quite closely to find what places need special care, and they will spray those areas with an especially strong cleaning fluid. To help all of this really work well, the carpeting that's been moistened with cleaning solution needs a good scrubbing. They do this with machinery that they call grooming equipment.
In a while, all of the dirt will have loosened up properly. And that's when they bring out the heavy equipment to extract all the dirt that's been loosened up. The cleaning is essentially done at this point. After this, it's mainly maintenance work. For instance, many commercial carpet cleaning services will neglect to neutralize the carpeting once the cleaning is done. You need to neutralize carpeting to make sure that it doesn't become electrically charged and it doesn't attract dust like a magnet. They will then brush the carpeting nicely so that all the pile faces the right direction. They'll bring the dryers in dry your carpeting, and then they'll inspect everything to make sure that all is as it should be.
Often, with some of the cheaper services, they'll hand you a work order that you're supposed to sign that they've performed all the steps; even when they haven't. You do owe it to yourself to make sure that this doesn't happen.