Little bottles of nail polish can dry out or go bad, but think twice before you toss the jars into the trash. Almost all nail polishes (with the exception of a few eco-friendly brands) have volatile chemicals in them, like toluene and dibutyl phthalate. These chemicals aren't just flammable -- they are considered household hazardous waste. Because of this, they should be disposed of with other household hazardous waste when you have special collection days in your community. In some cities, it's outright illegal to throw old nail polish in the trash.