Aerators actually do not rust, so it is likely that your aerator has calcified or mineralized. If you see a white powder on your aerator, it is likely this has happened. To fix this, soak your aerator overnight in white vinegar. Fast and affordable, and it works! Keep in mind that if you live in an area that has medium to hard water, you want to replace your aerator every 2 years to keep it working properly. Goodbye old aerator, hello fresh new one! Are you beginning to think you can do anything, or what? Click here to find out how to replace an aerator.