Mercy.
https://www.facebook.com/pristinecards/
I don't have an account but here is one of the comments reproduced on Blowout.
Pristine Card Cleaners
We get higher grades on cards all the time. The ONE thing we can not control is centering so 9 or 8.5 centered cards are tough. We have been able to get a gem on 9 centered cards because the surface, edges and corners have to be on point. The vintage cards are tougher because of the paper they used then and the overall age of the card. Can we improve them....yes but it is not taking a 1920 tobacco card from a 2 to a 6. The newer cards are usually littered with printing issues to the edges, surface and sometimes corners. These cards SHOULD be pristine but through the manufacturing process they are not. That's why you see photos of those because it is the largest portion of the speculator market and grades really impact the value of the cards.