Install a program with a noise removal filter, such as Audacity's inexpensive, open-source program. It will also display your audio track in wavelength form, so you will be aware of any unwanted sounds just by looking at the display.
Choose "Project" and then "Import Audio" on the toolbar to load up the program and import your audio file. Find the file location and select "Open." Your entire track will be visible on screen. Use the zoom function to get a closer look.
Select an area of the recording in which there is a lot of fuzz evident. Ideally, you want to isolate the sound, so try not to select any of your actual content. Instead, select only the unwanted sounds. Click and drag the cursor to highlight the area to make your selection.
Open the "Noise Removal" tool under the "Effect" heading. Click on "Get Noise Profile" in the dialog box and the program will identify the unwanted fuzz throughout the entire audio recording. Use the sliders to choose how much of this sound you want to remove and then click "OK." Play the audio track and listen to your noise-free recording.