I used the machine cleaner for the washing machine. It will always return residues from the washing center or from the dirt of the clothes in the washing machine. The best you can see it at the lint filter, where settles a gray lining. On the use of additional decalcifiers the detergent I renounce, because each brand detergent contains a decalcifier. But from time to time you should clean the machine. I have applied the cleaner almost as directed in the manual does it say that you should clean the lint screen before this, I have deliberately not to watch the result of the cleaner. The screen was with this gray coating coated (the machine had not been cleaned for approximately 1 year) after applying the filter and the drum looked like new. I can recommend the cleaner without limitation