How to clean a TV screen the right way | Avoid damage to your 4K flat screen!

I have connected my marantz 1509 avr with my tv LG CX and setup hdmi cec to control avr with tv remote. Volume and direction controls are working but select/ok controls are not working. Any solution?
 
For excellent sound that won't break the bank, the 5 Star Award Winning Wharfedale Diamond 12.1 Bookshelf Speakers is the one to consider!
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