Clean with a damp cloth only. Avoid using abrasive cleansers such as acetones, bleaches, or solvents directly on the surface. Do not add the plug in the bottom. Indoor use: Add the plug and make sure it is properly tightened. For effective drainage and absorption, we recommend placing expanded clay (Leca) at the bottom of the planter, about 3 cm deep. Outdoor use: Ensure proper drainage by allowing free and unobstructed flow from the planter. In freezing temperatures, ensure that there is no standing water inside the planters.