What is the best method and product to clean the MAC screen

Also see: How to clean your Apple products - Apple Support

I use a microfibre cloth - you can get them from Amazon - and just either breathe very gently on the screen or use a spray to put a little water on the cloth (the sort of spray you use for house plants). Never use anything stronger. Apple used to sell a product specifically designed for the older screens (iKlear), but it's not suitable for the present-day ones.

no I shut down Mac. use a lint free cloth and wet twitch water and ring it dry. wipe screen gently and I use lint free dry cloth to wipe finish. been doing this for years .