Cotton swabs are helpful for removing nail polishes from the edge of nails. I had never mind if polishes runs over the edge before and still I don't sometimes, but now I'm into making cotton swabs when I have time. Weird? hahaha.
Put nail remover on the point of toothpick.
Put a bit of cotton buds around it.
I really don't know why I'm into this. Maybe because it looks professional?