Using the Clean Audio magic tool can help to quickly get rid of unwanted background noise in your videos.
To utilize Runway's Clean Audio feature, start by dragging a clip from your assets into the timeline. Make sure the desired clip is selected, and then click the checkmark box beside Clean Audio in the right-hand side bar (under Audio).
Clean Audio will begin processing your video clip's audio, and progress will be shown in a percentage. Processing times will be dependent on the length and complexity of the audio.
Simply use the checkmark box to toggle Clean Audio on and off.