A gas station restroom is a restroom located at a gas station, which may either be located inside the convenience store or have an outside entrance. Gas station restrooms are often the dirtiest restrooms, being much dirtier than restrooms at other places. The reason why there are so dirty is because gas stations generally have only one or no janitors. Because of that, some gas stations have a sign up saying that they have clean restrooms at those particular gas stations. Despite the fact that the entrances to the restrooms are often outside, they are still locked if the gas station closes. They're locked because they don't want homeless people to move in, and they don't want other bad stuff to happen in the restrooms.