Bob Schmidt from Home Remodel Workshop teaches how to remove persistent carpet stains. Clean up the source of the stain as quickly as possible. Once the source of the stain is removed, mix one teaspoon of dish detergent with a cup of hot water. Pour the mixture on the stain. Soak clean rags in a bucket of hot water and place them over the spot. Place a hot iron over the rags and force steam into the carpet.