Postgresql : pg_temp & pg_toast_temp

       I am seeing there are many schemas created, this is specially when enabled "CONCURRENTLY" option for refreshing materialized views through table trigger.

pg_temp_1... pg_temp_30

pg_toast_temp_1... pg_toast_temp_30

If this is by design the temp schemas get created with the "CONCURRENTLY" option, is there any way to clean-up them automatically?

Thanks,

Vishu