So, I'm a guy. I do makeup and for the first time I just used nail polish. The colour is black so it's super noticeable. I'm very much a novice, so I was hoping that some other girls/guys could help here, because right now my nails look filthy.
The easiest way is just to scrape it off in the shower. The hot water will soften it and you'll be to peel or scrape it off or If it's covering your cuticles you can clip it off with a set of nail clippers.
OR if lazy girl lifehacks aren't good enough for you, you can ATTEMPT to clean it off with a q-tip dipped in nail polish remover. I find that I always screw that up though XD
I always use nail polish remover (with acetone). Dip that into cotton and dab it repeatedly unto the area with nail polish until the color is removed. Repeat the process to further remove the polish. Finally, you could use a que tip to clean your nails and make them look like what they used to before you applied polish.