Ok, so glitter is really pretty (as seen here). But, it's a pain in the but to remove. But if you use this method, it's not. So in this example I'm removing Color Club 'Holiday Splendor'.
1) Pour acetone, or acetone-based remover on a cotton ball. Place on nail and wrap tin foil around the nail. The bottom part of your finger should be covered.
2) Wait for 4-7 minutes (depending on the amount of glitter) and then remove. If there is a little bit of nail polish left on your nail can be whipped off really easy.
Now your done. ta da.