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Most machines have a heating mechanism for the water, but using hot water helps. Use water that is as hot as possible without actually being boiling. Only put as much water as the machine directs so that you don’t overfill the water tank. Look for a max fill line on the water tank. Some natural fiber carpet can shrink from hot water or be harmed by detergent, so always be aware of what type of carpet you are planning to steam clean. Steam cleaners usually use a detergent of some kind, so make sure to check the machine’s instructions to use the right kind. Only use the amount directed, as using too much soap will cause it to stay in the carpet. Some machines will have a specific compartment where the soap goes, and others might direct you to mix the soap into the water. Steam is not actually what cleans the carpet, a detergent or cleaner is. If you are sensitive to chemicals or want a natural option, vinegar is great for cleaning. Mix a 50/50 solution of vinegar with the hot water.
Fill the steam cleaner with hot water. Add soap as directed. Opt for vinegar over detergent.