Try Warm Water Method
Take a medium bowl and pour warm water into it. Now, put your finger tips into the mild water and wait for approximately 15 minutes until the nail polish softens well. Take out your hands from water and wipe them dry with a clean towel. Grab an emery board and gently scrap off the nail polish from your nails.
Note: Make sure to use water that is hot enough to be tolerated. Additionally, you can add a few drops of hand wash to the warm water.
Top coat method works
Take a top coat nail polish and apply a thick coat of it over the old nail polish. Take a cotton pad, tissue paper or a piece of fabric and wipe the top coat off. The top coat will soften the old coat and will take it off smoothly.
Note: Make sure to wipe the nail polish before the top coat dries.
Deodorant, Hairspray, or Body Spray Method
You can use the easily available deodorant, hairspray, body spray or perfume to remove your nail paint. Take a cotton swap, cotton ball or cotton pad and apply deodorant, hair or body spray to it. Now place it on your painted nail and rub it back and forth over your nail until the nail polish vanishes.
Note: Make sure not to leave the deodorant, hair spray or body spray on your nails for too long.