I have looked at this coin again and again, both in hand and in pictures and really can not see how there is any substantial cleaning and in fact looking IMHO very critically see it as not necessarily worse or better than others of similar date.
Here is a GRADED PCGS62 coin. Talk about cleaned? Wow. Admittedly just a photo, but here you go. Also enclosed is a cleaned AU coin to follow that looks cleaned. I chased down many other PCGS graded 1914's.
Honestly, much as I dislike playing games, I'd be super tempted to either resubmit to PCGS or send it over to NGC. The value is different enough after all and it's a special coin. Don't get me wrong I have several coins I've disagreed with, but have only sent in a couple as it made a difference. One came back the same and I'm super tempted to cross services (a scarcer Albanian). I just don't see what they are referring to and PCGS seems to be more generous anyway, and I'd like it out of that NGC 62 slab as I just don't see why it's not a super solid 63 or even 64. I don't know why it bothers me so. It's still the same coin despite the plastic and in hand it's quite pretty. Another one (I can't remember if I mentioned it here or on the other message board, or not at all) one of the services seemed to mistake adjustment marks as something more nefarious. It was a 17-something Genoa 4L, and got crossed from a 58 to a 62 slab. And the Japanese type II 1870 yen went from cleaned to 62. Those were worth the effort. That said, before I do that, I'll take it with me to a coin show next time I get to one and have someone give me a second opinion with it in hand before I waste time or money. I may have the 'ownership bias' goggles on so to speak. Kind of like beer goggles, but you know, with coins. I do love the Caballito design!!!!