How to get rid of the yellow stain on nails due to nailpolish?

1. Use an old toothbrush to clean your nails with some whitening toothpaste. Rinse and repeat. 2. Soak a cotton ball with 3% hydrogen peroxide. Rub it onto your nails, then let dry. 3. Dissolve a tablet or two of denture cleaner into a small bowl of water. Then, soak your nails for about five minutes. 4. Mix 1 tablespoon of 3% hydrogen peroxide and 2-1/2 tablespoons of baking soda in a small bowl. (This will be paste-like in consistency.) Then use a cotton swab to press some of the mixture firmly under the tip of each nail and across the tops of each nail. Keep this mixture on your nails for 3 minutes, then rinse. 5. Lemon acts as an astringent and will strip away stains from your nails. Simply rub a slice of lemon directly underneath and on top of your nails. Or, soak your nails in water combined with lemon juice or lemon slices. 6. Use a white pencil underneath the nail tip.

I have had it once and i scrubbed toothpaste with whitening effect on my nail daily. After a week my nail is white again. You should try it. Hope this helped.

Before applying dark nail polish apply base coat to your nail,pat it dry then apply the the dark nail polishes.