Swifter dusters do a great job on the tv screen. No need to get it wet.

The phone screen can just be wiped with a barely damp towel and then dried immediately.

I just use one of those microfiber cloths marketed for cleaning screens, like these:

https://www.amazon.com/MagicFiber-Microfiber-Cleaning-Cloths-PACK/dp/B0050R67U0/ref=sr_1_1_sspa?crid=32B693SNMP8D&keywords=screen+cleaning+cloth&qid=1566569908&s=gateway&sprefix=screen+cleanin%2Caps%2C159&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyTjFPUVdLUEhQOUZPJmVuY3J5cHRlZElkPUExMDQ1NTI1MzhLMFhZWU01MlRQVyZlbmNyeXB0ZWRBZElkPUEwOTMyMDczM01PM0Y5QTNKUTlMVSZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=

Just gently rub the screen until the streaks, fingerprints, and smudges are gone.

My friend moved away and bequeathed to me all her cleaning supplies. Among them was a thing of Windex brand wipes made specifically for cleaning screens. They work perfectly on both TVs and phones/tablets.

How in the world do I clean the screen of my flatscreen television set?

Windex leaves major streaks.

Also how about the screen on my iPhone XR?

Thank you so much.