Some way to clean up / identify contents of /var/lib/docker/overlay

I tried

docker system prune -a

No luck…
Checked my log sizes

du -shc /var/lib/docker/containers/*/*.log

they were already fine since I use

logging:
		options:
			max-size: "10m"
			max-file: "5"

then checked my overlay2 folders

du -shc /var/lib/docker/overlay2/*/diff

found 182G being used ! So I identified the major offenders:

du -s /var/lib/docker/overlay2/*/diff |sort -n -r 

Top one had 167G for a single folder, ouch.
Then linked the overlay2 folder back to the container with

docker inspect $(docker container ls -q) |grep ‘FOLDERIDHERE’ -B 100 -A 100

Now that I have identified the container went and did a docker-compose down;docker-compose up on it.
Overlay2 folder was cleaned up and I am 167G richer!