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 withstand being put in the dishwasher. Maintenance of white, black and gray: To clean lacquered Bowl Bowls, the frame must be wiped with a cloth. Bowl Skål can be washed with a mild soap under warm water.