Vinegar contains the acetic acid, which is an effective solvent that can dissolve oil and many other compounds. Using a rough paper towel will help exfoliate the skin,and remove layers of dead skin cells that are stained by the ink.

How would you rephrase that briefly using Vietnamese?
Xịt hoặc thoa giấm trắng lên vùng da có vết mực, sau đó dùng khăn giấy lau sạch.