hmm deppends , i dont have an LG so i dunno but here is wat u need to look for.
if its glass , NO PROBLEM , IF ITS not GLASS DONT USE Alchohol.
if you have a screen protector DO NOT use alcohol , its just gona scrap it
the best thing to use is a Wipe for sun glasses , witht he combination of MONSTERSPRAY ( from the company monster ) they make TV cleaners for LCD , it also works good on cells.