Use a video editor with built-in audio noise reduction
Import the video into the editor
Separate or unlink the audio from the video
Select the audio track
Apply noise reduction or denoise effects
Adjust noise reduction strength carefully
Use a high-pass filter to reduce low-frequency hum
Use a low-pass filter to reduce high-frequency hiss
Apply a noise gate to cut silent background noise
Use an equalizer to reduce unwanted frequencies
Remove clicks, pops, and hum with repair tools
Normalize or compress audio after cleanup
Replace unusable audio with a clean voiceover if needed
Export the cleaned video with the improved audio
Use external audio software if the editor is not enough
Record in a quieter environment for better results next time
Use a directional microphone to capture less background noise
Add a windscreen or pop filter when recording outdoors
Keep microphone gain as low as possible without clipping
Use headphones to monitor noise during recording