From the people who developed the visually impressive waveform spectral display (seen in Adobe Audition) that leaves visiting clients in amazement at our high tech sophistication .... Izotope RX4.

https://www.izotope.com/en/products/audio-repair/rx/

It's the Photoshop of audio editing and repair, turning your unusable rubbish audio in to something much much better. They even have an echo removal tool. Seriously.

Andrew

Found some promo videos:

RX 4 and RX 4 Advanced Overview | Audio Repair and Enhancement Toolkit - YouTube

and

The Pros Talk RX | Audio Repair and Enhancement Toolkit - YouTube

Andrew

The RX suite is amazing.