Question, how do you guys clean the screen? Any specific product to use or just plain dry cloth?

Struggling and eyesore with dusts and at times finger marks of the kids.

I am interested to get the 42" LG C4 OLED 4k tv, but so far can't find it here locally through Shopee or Lazada.

Senheng, Harvey norman all selling minimum 48".

I wanted to put one inside my study room, but 48" is wayyy to big. 
42" is the sweet spot.

Planning to use it to play my PS5 Pro only.

after extensive research on reddits, AVforum & youtubes, I think 48" OLED TV is doable in my small study room.

just that i need to ensure my desk's depth is 60cm or larger, so that i can push the tv back further touching the wall. this hopefully will gives me at least 1.5 meter / 5 feet from the screen.

since this is first time i will venture in OLED technology, if just playing PS5 Pro only say ~2 hours for 3 days per week, when will i expect the burn in to happen in the future ya?
i play mostly RPG games like Demon Soul, some FPS games & action games.

LG only offers 2 years burn in warranty? If let say i buy at Senheng, can i extend the warranty to 5 years?