Cawan camera lens with a suede, how to confirm there is no damage to the lens surface coating?

Users questions: Some hard-edge suede, with this part of the contact with the lens out. Can judge from the footage you, such as take a white or reflective surface of the lens observed by you?
Experts answer: is not so fragile coating is best to use special equipment to buy, but the lens pen is a good choice
  • This information provided by the users.Thanks!