How do I cleanup/delete the old ASM foreign_archivelog files?To delete archive logs on Logical standby instead of RMAN, you can use parameter LOG_AUTO_DELETE to TRUE by using DBMS_LOGSTBY package
Or keep a few days ( change in RMAN script )
rman target sys/<password> nocatalog rman>crosscheck archivelog all rman>delete expired archivelog all
If RMAN see them you can use it to remove them and the "crosscheck archivelog all" should keep the system happy.
$ORACLE_HOME/bin/rman <<EOF connect target / crosscheck archivelog all; delete noprompt expired archivelog all; exit EOF