As mentioned above, Kärcher's Floor Cleaner Detergents have foam stop agents. However, the first few times a floor is cleaned there can still be foaming. Previous detergents you have used can leave a film on your floors that is collected by your Kärcher Hard Floor Cleaner the first few times you use it. This initial foaming is usually occurring as a result of the old detergent. Once you have used your Kärcher Hard Floor Cleaner along with the Kärcher Detergent on your floors, this film will be removed and the foaming should stop.