Let's face it, we've all wiped our glasses on our T shirt, jumper or cardigan.
A sure-fire way of getting micro-scratches…
For daily cleaning, just remember one word: microfibre cloth (OK that's two…).
To remove marks and specks, odon't go at it with your fingernail,
it will only make matter worse : use water (lukewarm or cold), and if that doesn't work, add a little soap.
You can also do this when returning from an afternoon at the beach, for example, to get rid of potential grains of sand or traces of sea salt.
Most important of all, never use alcohol or excessively harsh products. At most, a cleaning spray recommended by your optician and nothing more!