You need to use a carpet shampoo machine. If you don't have one, you can rent or buy one. If you are not familiar with the shampoo machine, be sure to read the instruction manual fully. Typically, you will start by filling the water tank area with water to the directed water line then add in the carpet soap. Shampooers are not meant to be pulled back and forward, so you will need to walk the machine from wall to wall. Move the machine to a new line and walk it back to the initial wall until the entire room has been cleaned. Be sure to run the machine across the room a second time; however, this time do not add any soap to the reservoir.