求翻译：　　2、平常擦拭沙发时请勿大力搓擦，以免损伤表皮。每周一次用干净毛巾蘸水拧干后对沙发轻拭。是什么意思？

　　2, do not rub vigorously rub when normally cleans the sofa, so as not to damage the epidermis. Once a week with a clean towel dipped in water and wring gently wipe dry after the sofa.