WAL file clean up

I have the 'archive_cleanup_command' command specified, but I still have
WAL files.
The documentation seems to indicate that it will run automatically, but it
doesn't seem to be running.

archive_cleanup_command = 'pg_archivecleanup
\\\\DISKSTATION\\AccessData\\Prod\\WALfiles %r'
# command to execute at every restartpoint

It seems it should run every time there is a restartpoint.
Restartpoints can happen at any checkpoint in the log.
My checkpoint time out is set to 5 minutes.

checkpoint_timeout = 5min

Restartpoints are more likely to happen when getting closer to the size
limit.
max_wal_size = 1GB

My folder size is now 430 files = 6.8 GB. Not terrible, but should be
enough to trigger a restartpoint.

How do I tell if I haven't had a restartpoint or I did and the command
didn't work.

No errors in the pg_log

Thanks,
Brad.