diff --git a/docs/source/content_generators.rst b/docs/source/content_generators.rst
index fcbe31d4..4acbd8c0 100644
--- a/docs/source/content_generators.rst
+++ b/docs/source/content_generators.rst
@@ -115,6 +115,8 @@ Metadata will be provided by the Content Generator as a JSON file. There
 is a proposal of the :doc:`Content Generator
 Metadata <content_generator_metadata>` format available for review.
 
+.. _cg_api:
+
 API
 ===
 
diff --git a/docs/source/server_howto.rst b/docs/source/server_howto.rst
index a1e630f4..59834d4d 100644
--- a/docs/source/server_howto.rst
+++ b/docs/source/server_howto.rst
@@ -518,11 +518,19 @@ appropriate age setting. Default value of one day should be ok for most
 deployments. As there will be tons of freed records, additional VACUUM can be
 handy.
 
-::
+.. code-block:: sql
 
-   DELETE FROM sessions WHERE update_time < now() - '1 day'::interval;
+   DELETE FROM sessions WHERE update_time < NOW() - '1 day'::interval;
    VACUUM ANALYZE sessions;
 
+Optionally (if you're using :ref:`reservation API <cg_api>` for
+content generators), you could want to run also reservation cleanup:
+
+.. code-block:: sql
+
+   DELETE FROM build_reservations WHERE update_time < NOW() - '1 day'::interval;
+   VACUUM ANALYZE build_reservations;
+
 Set User/Password Authentication
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/util/koji-sweep-db b/util/koji-sweep-db
index 39e305f2..8a83df24 100755
--- a/util/koji-sweep-db
+++ b/util/koji-sweep-db
@@ -19,6 +19,18 @@ def clean_sessions(cursor, vacuum):
         cursor.execute("VACUUM ANALYZE sessions")
 
 
+def clean_reservations(cursor, vacuum):
+    q = " FROM build_reservations WHERE create_time < now() - '1 day'::interval"
+    if options.verbose:
+        cursor.execute("SELECT COUNT(*) " + q)
+        rows = cursor.fetchall()[0][0]
+        print("Deleting %d build reservations" % rows)
+
+    cursor.execute("DELETE " + q)
+    if vacuum:
+        cursor.execute("VACUUM ANALYZE build_reservations")
+
+
 if __name__ == "__main__":
     global options
     parser = OptionParser("%prog cleans koji database")
@@ -72,4 +84,5 @@ if __name__ == "__main__":
     cursor = conn.cursor()
 
     clean_sessions(cursor, options.vacuum)
+    clean_reservations(cursor, options.vacuum)
     conn.commit()