Recently, I sat down and cleaned the forty plus rims of my OPI, Sephora by OPI, and Essie nail polish bottles. When nail polish accumulates on the rims of bottles, the bottle can't close as tightly or evenly. More air enters your bottle which eventually leads to the polish inside drying out faster. You can extend the life of your polish collection by keeping the rims clean when applying the polish and by periodically cleaning the bottle itself with acetone. I'd suggest using paper towels instead of cottonballs or rounds. The cotton fibers tend to get stuck everywhere (yep, I found out the hard way).
Cleaning my collection also helped me rediscover some colors I forgot I had, and reminded me to be a bit more reductionista (borrowing that term from Liz) in my ways. But, there's still a little room for the Lippmanns that I've been eyeing, right? Which reminds me, I still have all my luxury and drugstore polishes left to clean. Sigh. Have you performed any polish stash maintenance recently? Do you have any tips for nail polish or makeup stash maintenance?