Docker Desktop Windows - disk space consumption

I run most of my reviews using Docker Desktop on Windows 10.
According to the recommendations, I clean up docker and downloaded repositories after tests: 
Repos are simple but Docker is somewhat resistant to release the consumed disk space.The steps I executed initially:

• remove pending containers  docker rm -f -<container> . . .
• delete downloaded images   docker rmi <image>  . . .
• clean caches and networks  docker system prune

But my consumed disk space didn't shrink.

So using Google I found a useful method to shrink Docker's disk consumption.
I would l like to share this experience with you.
I skip all the well explained details that you may see here 
The reason behind this unfriendly behavior:
- Docker creates a virtual hard disk ext4,vhdx
- this disk image is growing and growing automatically as needed
  but it never shrinks.
( I didn't talk about IRISTEMP od CacheTemp )   

My result after facts:  ~15 GB of storage returned !!
A significant amount on my 128GB SSD  Notebook

The condensed action:

• From Docker Icon on taskbar: 
  • Docker quit 
• From Windows CMD line. :
  • WSL --stop 
• From PowerShell with Administrator rights:
  • Optimize-VHD -Path c:\Users\<your_username>\AppData\Local\Docker\wsl\data\ext4.vhdx -Mode Full  
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