As annoying as that sounds, the handprints should polish out. I recommend trying a reputable polish like Autoglym, which I'll link to below. Polish removes grease, debris etc, as well as stripping away a tiny layer of the paint’s top coat - which reveals the fresh paint beneath. Therefore, don't go overboard with the polish - but polish it and then wax it if you can as the wax should help protect against some of those handprints. Halfords and various other retailers sell these products if you want to go in-store or order from there, or you can buy through Amazon.

We recommend a polish like Autoglym Super Resin Polish (amzn.to/2XOvzna), followed by Bilt Hamber Double Speed-Wax (amzn.to/2Wvdg59). The wax should last a while so you shouldn't need to wax it for a few weeks or even a couple of months.