In order to perform maintenance of the Philipiak dishes effectively, you have to use dish care products made for the maintenance of stainless steel dishes, e.g. Inox Lux cream cleaner. You should not use sharp sponges nor scrub, because it may scratch the dish surface. In case of sediments from the water, you can use a mix of water and vinegar or water and lemon juice to remove the sediments. Mix has to be diluted in 5:1 water to vinegar ratio. After using the mix, wipe with a soft cloth.