Audio Book Cleanup

I need an audio professional to clean up my audiobook. The task involves removing unwanted background noises and ensuring high-quality voice output. There are a total of 21 files, each approximately 600MB.

Key requirements:
- Remove background sounds like:
- AC humming
- Old house noises
- Any other unwanted noises
- Deliver cleaned and polished audio files.

Ideal skills and experience:
- Proficiency in audio editing software capable of handling large files (600MB each)
- Experience with noise reduction techniques
- Attention to detail and high-quality output

Please provide samples of previous work for review.