PostgreSQL Cascade streaming replication problem

Hi everyone,

i have one master and two slaves - cascading replication. Master -> Slave1
-> Slave2

Slave2 crashed two days ago. Problem is on Slave1, where are comulating WAL
files. Archive mode is turn off. There is about 6.000 WAL Files, but in
folder archive_status are files with .done name.

How can I remove WAL files, which are "waiting" for Slave2? I changed
configration on Slave1 (i commented this options "wal level = hot_standby"
and "max_wal_senders = 1"). But without effect.

What did i do wrong? I need stop comulating WAL files and remove old WAL
files, which are processed and are only "waiting"..

Thank you for your tips.
Regards,

Jakub