<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _clean_workers(self):
 """Delete periodically workers in workers bag."""

        while self._bag_collector:
            self._bag_collector.popleft()
        self._timer_worker_delete.stop()