Is it possible to remove coating while cleaning lens front element?
I have very gentile cloath, some type of leather, or something similar so I can not scratch it, but some of the stains are very stubborn so I need to rub them much more than just cleaning streaks
If this happens with any frequency you might want to consider putting a filter over you lens, something like the Hoya HD Protector. These are some seriously strong/hard filters and they're amazingly easy to clean; I run mine under the kitchen faucet when they're dirty and that's about all it takes.... some of the stains are very stubborn so I need to rub them much more than just cleaning streaks.