Basements are a little more difficult to clean after experiencing water damage because of how the room is below ground, but if you are able to remove the bulk of the liquid in a short time, your carpet may be salvageable. Deep cleaning your carpet can be a lengthy process, but it can be worth it if it means not having to pay to replace the entire room's carpet.
Clean The Subfloor
Your subfloor is whatever is under your carpet and carpet padding, and since dirt and odors sink, this is where you'll need to start. If you have a concrete subfloor, take up the carpet and padding, then use a mixture of water and bleach to scrub the concrete. You don't need to use so much water that you would need a wet vac to clean it up; instead, just set up some fans and a dehumidifier to help it dry faster.
If you have a wood subfloor, you'll need to be a little more careful. Use a mixture of bleach and water or vinegar and water to scrub the floor, but be careful not to soak the wood. Work in small areas at a time to prevent the wood from getting too wet.
Wash The Carpet Padding
Carpet padding is a little more difficult to clean because of the way it absorbs liquid, but this is where a special tool called a water claw comes in handy.
Spread a mix of vinegar and warm water over the carpet padding with a sponge, then let it sit for about half an hour. Next, scrub a mixture of dish soap and warm water into the carpet padding, being extra thorough in dirty and odorous areas. Finally, rinse the pads with cool water, being careful to get the vinegar and dish soap out.
When your pads are thoroughly washed, take a water claw – which can be rented or bought from many hardware stores – and attach it to your wet vac. Stand on the claw to apply pressure to the pad and squeeze the water out, which is then sucked up by the wet vac. Get as much of the water out as you can.
Finally, sprinkle baking soda over the pad, let it sit for about 15 minutes, then vacuum it up.
Steam Clean Your Carpets
Make sure your subfloor and padding are dry before you lay your carpet back down and begin cleaning. Once the padding is done, you can use a standard steam cleaner or carpet shampooer to clean your carpets. If you don't have padding, this step is the same, though you might want to be a little more thorough and go over your carpet a few times.
When you're finished, set up some fans and a dehumidifier to let it dry, and your carpet should be clean and smelling fresh. If the water damage is too extensive to handle on your own, contact a water damage restoration company for assistance.