You may need to buff the screen for 5 minutes or maybe more before all fingerprints and smudges have been removed. Use a specially formulated electronic wipe. Use a wipe that is exclusively built to clean Liquid crystal display screens. Wipe it over the total screen, Doing the job from https://www.linkedin.com/posts/anhometech_anhome-keyboard-cleaner-kit-cleaning-tool-activity-7180578955060473856-5DHX?utm_source=share&utm_medium=member_desktop