On our men somewhat uneven tiles to dirt had set. I've gotten with vinegar cleaner and a brush, while I have also removed the dirt from the joints. Unfortunately, the ground seemed that so piebald. Since the Esiigreiniger and also the tiles Kraftreiniger have very smelly, I looked for another product. The cleaner offered here does not stink! I have roughly distributes it with a soft nylon brush in the grout. After a short exposure I then brushed out him with a nail brush. That went pretty smoothly. Of course, I have this location on my knees and I do not need every week. But: The result is sensational! Before all joints were black, now they are again bright as originally. The living room looks like new! Highly recommended, does not smell and is relatively easily, hopefully it lasts a long time ago!