Move the Furniture
Once you have home carpet steam cleaners on hand to clean the floors, you’ll want to slide all furniture out of the way so you can easily access the carpet with your steam cleaner. Moving the furniture will allow you to quickly remove stains and dirt by carpet steam-cleaning and will also protect wood pieces and other decor from damage. Use a handheld steam cleaner once the furniture is out of the way to clean bathroom and kitchen tile and countertops.
Vacuum the Floors
Use a regular vacuum, not a steam vacuum cleaner, to clean your carpets before you steam clean them. This removes the top layer of dust, dirt, and crumbs so that the steam cleaners can focus on deeper stains and grime. Even the best carpet steam cleaner will work better on freshly vacuumed carpet.
Just Add Water and Cleaner
Fill the water container with hot water and a bit of cleaning solution; some steam cleaners come with a bottle of detergent, but you can also purchase carpet shampoo or soap at a grocery store. Be sure to follow the directions before using your home carpet steam cleaners on your floors; adding too much soap to even the best carpet steam cleaner can damage the machine and ruin your carpet.
Start in the Far Corner
Before using a carpet steam cleaner, figure out a way to clean the entire room efficiently. You’ll want to make clean, straight lines while carpet steam cleaning to be sure that you don’t miss any spots. Beginning in the corner furthest away from the doorway or entrance to the next room will make it easy to move your carpet steam cleaner into the next room.
Let the Carpet Dry Completely
When you’ve finished scrubbing the floor with a steam vacuum cleaner or floor steamer, let it air out and dry before you replace the furniture or walk on the carpet. If you had to use a lot of shampoo with your floor steam cleaner, you’ll want to be sure that the floor was rinsed properly and has plenty of time to dry. Wear socks or cover your feet with plastic bags to prevent your shoes from soiling the carpet again or getting wet while the floor dries.
Protect Yourself from Fumes
If you use any shampoo or soap with your floor steam cleaner, chances are the scent will linger and permeate the room. Prevent the smell from overtaking your home or making you sick by airing the room out with a portable fan or opening windows and doors. You should also go outside after using a steam cleaner, either a floor cleaner or handheld steam cleaner, to avoid getting a headache from the smell.
Source - https://www.overstock.com/guides/how-to-use-a-carpet-steam-cleaner