Try going to a nail salon, and just ask them.  they might have some special nail stuff that can take away all marks from your nails  , I had a sample of this special nail remedy (to soften up roughness on nails) and it worked, my nails looked pretty good, you should try it, any nail remedy could work, just go to a nail salon, or go to the "Body Shop" that place works great!!! It has tons of lotions

Hope this helps!