Easy way of pruning pg_data?

Hi All
given the folowing:

ls -l pg_data/base
drwx--S--- 2 postgres postgres 2048 Apr 15 2001 1
drwx--S--- 2 postgres postgres 2048 Aug 27 12:26 1007014
drwx--S--- 2 postgres postgres 2048 Sep 15 08:57 1045851
drwx--S--- 2 postgres postgres 2048 Apr 15 2001 18719
drwx--S--- 2 postgres postgres 2048 Apr 15 2001 18735
drwx--S--- 2 postgres postgres 2048 Apr 15 2001 18891
drwx--S--- 2 postgres postgres 2048 Apr 15 2001 18916
drwx--S--- 2 postgres postgres 4096 Oct 12 20:09 19100
drwx--S--- 2 postgres postgres 2048 Apr 15 2001 192660
drwx--S--- 2 postgres postgres 2048 Apr 15 2001 206353
drwx--S--- 2 postgres postgres 2048 Apr 15 2001 206889
drwx--S--- 2 postgres postgres 2048 Apr 15 2001 207360
drwx--S--- 2 postgres postgres 2048 Jun 5 10:44 639889
drwx--S--- 2 postgres postgres 2048 Jun 5 11:19 643727
drwx--S--- 2 postgres postgres 2048 Aug 1 12:28 953493

Is there an easy way to housekeep (prune) these directories?
Thanks in advance
Lee