Default Best screen protector?

Hiya, i recently brought a used galaxy s4 from ebay, the seller said he had it for under a year and used a screen protector on it.
When i recieved it the screen was very smudgy after using it for not very long, and these fingerprints are hindering the great display tbh, im pretty sure the oleophobic coating has worn off!!
What would be the best solution regarding this? Would it be best to get a screen protector? If so, which one is the best?
Thanks alot

Sent from my GT-I9505 using XDA Premium 4 mobile app