How can you use Audacity to fix a recording that sounds scratchy?

To fix a scratchy recording in Audacity, first, import the audio file into the program. Use the 'Noise Reduction' effect by selecting a small portion of the scratchy sound as a noise profile, then apply it to the entire track. Additionally, you can utilize the 'Equalization' effect to reduce harsh frequencies and enhance clarity. Finally, consider using the 'Compressor' to balance the audio levels for a smoother sound.