The first time I've used in our sink in the kitchen the cleaner, I no longer have to get almost the mouth .... how much filth so still going and how bright and new can shine my sink .... gross. So to occasionally make even properly clean the cleaner is recommended. Not only for the sink ... for everything andere..sogar jewelry you can even pull and clean through the sponge. And what's also great that after cleaning the first time only repelled by the layer, the water and no water spots leaves.