Freeing space from Docker on Windows WSL

run.sh

# Freeing space from Docker on Windows WSL
# (No need for HyperV and optimize-vhd: works on Windows Home Edition)

# Make sure to keep the images you really need running on Docker, this way the following command will
# only delete the cached layers:

# On WSL:
docker system prune -a

# On PowerShell:
wsl --manage Ubuntu -s false
wsl --manage docker-desktop-data -s false
wsl --manage docker-desktop -s false
wsl --list --verbose
wsl --shutdown
diskpart

# On Diskpart:
select vdisk file="C:\Users\<YourUser>\AppData\Local\Docker\wsl\data\ext4.vhdx"
compact vdisk
detach vdisk
select vdisk file="C:\Users\<YourUser>\AppData\Local\Packages\CanonicalGroupLimited.Ubuntu_79rhkp1fndgsc\LocalState\ext4.vhdx"
compact vdisk
detach vdisk
exit

# Back on WSL:
wsl --manage Ubuntu -s true
wsl --manage docker-desktop-data -s true
wsl --manage docker-desktop -s true

The secret is to also free the one in Docker app data, not only the Ubuntu one...

Also, WinDirStat is a pretty awesome GPL app: https://windirstat.net/