I don't think I'm the only one here annoying over those smear of fingerprints on the iMac screen,
so, in the last few days I've been trying to get rid of it. I tried water alone, didn't work, I tried a little bit of soap and although I was concerned about using soap because of all the chemicals found in soap, I took a chance to see if I could get rid of those smear of fingerprints but, it made the situation even worst. Not knowing what to do I decided to use the same product I use to clean my watches (Veraet Watch Spray), and I'm glad I did. My screen looks as clean as crystal now. 