Use Off bug spray (aerosol) to remove nail polish stains. Place a cloth underneath the stain to blot anything that might bleed through. Spray the bug spray onto the stained area until it’s saturated. Then rub with a cloth or toothbrush. Repeat as the stain lifts and then launder as usual. If there’s still a bit of stain remaining, don’t place the jeans in the dryer. Try spraying hairspray onto the stained area and launder as usual again. Try pure acetone, too. I suggest purposely staining a piece of cotton fabric and testing stain removing methods before attempting the jeans. This will allow you to use the least amount of chemicals on your jeans.