Hi there
The anti-reflex coating has changed from older versions, due mainly to ROHS regulations. The glass is now treated with a chemical, rather than using a lead treatment system.
This makes the screens slightly less durable - so don't go rubbing in the same spot for too long as there is a very real chance you could erode the coating.
The best idea to clean the screen is just using warm water and a NEW chamois cloth. Moisten the chamois and wring nearly dry, then 'wash the screen' (you will notice it will appear to smear), then wring the chamois dry and dry the screen.
But beware, it does take some time and effort. Be patient as it's worth it. To maintain the screen from dust etc, use a fine weaved microfibre cloth