Never use a wire brush or scrape with tools on a Kubus product. Please note, if you want to use Bowl Bowl for plants, or storage of food or fruit, you must use the insert. Be sure that there is no liquid between the insert and the Bowl Bowl. Flowerpots and vases can be used both indoors and outdoors. If they are used outside, they must always be taken inside when the temperature falls below 0?C. Use the protective insert if you want to plant in the Flowerpot. Bowl Bowls, Flowerpots and Vases cannot stand being put in the dishwasher. Maintenance of Brass : Brass is hand polished which means that their surfaces are not identical. Brass is a material that develops patina and the surface of the product will therefore change character over time. Use a steamed cloth with washing-up liquid to clean Brass. Remember to wipe off detergent residues after cleaning. Since this is an untreated metal, it requires extra maintenance. Do not expose it to moisture or liquid as this can cause rust.