If coating wall is very dirty, pink touchs usable gesso or precipitation sex calcium to grind on cloth, or use graze of fine sand paper, same can purify besmirch.

• 涂料墙壁假如非常脏了，可用石膏或沉淀性钙粉沾在布上磨擦，或使用细砂纸轻擦，同样能够去除污渍。