How to clean local Bazel repository cache "content_adressable" folder?

[MTomBosch]

For local PC based development we have enabled the Bazel disk cache and repository cache.

The repository cache root folder has two subfolders:

contents

content-adressable

The "contents" folder cleanup can be triggered by the Bazel cli arguments --repo_contents_cache_gc_...

But how can the "content-adressable" folder cleanup be triggered if at all?

If there is no Bazel inbuilt way to clean it what is the best practice to manually clean it up?