求翻译：5.如沾有污渍，可用干净抹布沾水擦拭去，为免留下印迹，最好从污渍外围抹起。丝绒家具不可沾水，应使用干洗剂。是什么意思？

5. If stained with dirt, wipe to clean cloth damped in water are available, to avoid leaving marks, preferably from the dirt from the perimeter. Velvet furniture not spray should be used dry cleaning agent.