Are you quick to deem a beauty product DOA when it still has plenty of life left in it? Stop right there! We've got some seriously simple ways to revive your favorite polish. The first step is to make sure there is still polish in the bottle. There's no use trying to save something that isn't even there. One of the main goals is to break down polish that is thick and dried out. For starters, it's important to shake the polish well and stir things up a bit. There are four products commonly used to bring polish back to life - nail polish thinner, paint thinner, acetone or an acetone-based nail polish remover. Invest in a bottle of nail polish thinner which can be found at a local cosmetics store. Use an eye dropper to add five or six drops of nail polish thinner to the bottle. Twist the top back on and shake. You may have to repeat this step several times to get your polish back in tip-top shape. You may even want to add some clear nail polish to the bottle for a thicker consistency.