here is a card that I smudged just for this post to show you what I normally do without trying:
I had to darken this to make the print visible, in real life it is very visible!!
To remove the print I just simply lightly sanded the area of the print, I sanded of the ink leaving the paper unmarred.
you can see there is no more finger print! I accidentally hit to much of the layer paper and then tried to fix that (black smudge) Well I sanded that and then added a layer of ochre colored pencil and you can' t see that error now. This also works on stamp "halo's"!!)
I also use these sand blocks to give my new stamps a quick rub to take of the silicone coating from the factory. That is why new stamps often don't stamp well. The blocks are also great for distressing!
I hope you find this trick helpful, it has been a huge time saver for me!
Have a great day!