Wipe the nail polish off with damp cloth
First of all try your level best to wipe the nail polish off before it dries out. For this purpose, simply take a clean wet piece of cloth and firmly wipe the stains off.
Try baking soda
Baking soda, easily available in your home, is one of the best remedies to remove nail polish stains from the sink. Take a medium bowl, place a generous amount of baking soda in it, and pour in some water. Grab a medium spoon and stir it until the water and baking soda mixes well and forms a thick paste. Apply the paste to a soft scourer used for washing dishes, and scrub it against the stains in circular strokes. Continue scrubbing for around 10 to 15 minutes and turn on the tap to wash off the paste. However, if the stains are yet not removed, then do not worry and apply the remaining paste to the stains. Leave it for another one hour or overnight and see the magic.
Note: Never make the mistake to use a wire sponge for this purpose as you can get unwanted scratches on you sink.
Non-acetone nail polish remover also works
Non-acetone nail polish remover is another simple way to remove nail polish stains from your sink. Take a paper towel or a piece of fabric and dip it into a non-acetone nail polish remover until it dampens well. Now, place the wet towel or cloth on the stain and scrub the offending blotch with full force. Let it sit on the stain for at least 5 minutes and rinse it off with water.
Note: It is better to use a piece of cloth as paper towel can absorb large quantity of the Non-acetone nail polish remover.
What about a strong bleach solution?
Take a water bucket and mix equal parts of bleach and water in it. Stir it with a stick until it forms a strong solution. Take a small brush with soft teeth, dip it into the mixture and rub it against the ugly nail polish stain on your sink.
Note: You can get scratches on your sink therefore it is better to use a toothbrush for applying the bleach solution.