How do I clean screen of LCD LG monitor? - LG 22" FLATRON LCD Monitor

https://www.lg.com/us/support-product/lg-50PS80-UA

I think the remote is broken ,you need replace a new one.
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screen out of works.
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It depends on the kind of dirt you've got on the LCD screen.

Dust and fingerprints may be safely removed using a tissue-non-tissue or microfiber cloth, sold in most camera shops. It's exactly the same supplied with most glasses, only bigger. It works without moistening. Do not press overmuch, but wipe it repeatedly, and even the sturdier fingerprint WILL come away eventually.

There are also specially formulated moist-wipes. They're more expensive and only good for one use each, but are good to clean dried spills such as specks of sugared coffee or an explode-on-open Coca Cola can. You'll find them in most computer shops.

Bulb has failed, replace and clean all cooling fans of dust.

This is what happens when you use a spray glass cleaner on an LCD monitor. The spray gets into the edges of the plastic and eventually behing the mylar screen. There's no safe way to clean it that I know of. Ta