Audacity is a free audio editing program that offers lots of ways to improve the quality of your sound recordings. The software comes with lots of different effects and working with any kind of audio file in Audacity is simple. Let's find out how to clean up a piece of audio that has unwanted noise in it. The first step is to select the sample of a few seconds of the noise, interference, or static sound that is in your recording. Once this sound sample is selected, we simply select all the track and clean it. Audacity will remove all the similar noise that it finds in the track. The result is very impressive.