Delete failed entries in multipath

Due to some changes, I have to force a rescan of Fibre Channel devices on a CentOS 6 server. This is the output of multipath -l: (...) 36000144000000010f01c857894aede59 dm-50 EMC,Invista size=5.0T features='1 queue_if_no_path' hwhandler='0' wp=rw `-+- policy='round-robin 0' prio=0 status=active |- 7:0:3:107 sdca 68:224 active undef unknown |- 4:0:3:107 sdbd 67:112 active undef unknown |- 7:0:4:107 sdeb 128:48 active undef unknown `- 4:0:7:107 sddg 70:224 active undef unknown 3600601602bd14600351eb55f237aa77d dm-5 DGC,VRAID size=3.0T features='0' hwhandler='1 emc' wp=rw |-+- policy='round-robin 0' prio=0 status=active | |- 7:0:7:39 sdq 65:0 failed undef unknown | `- 4:0:6:39 sdei 128:160 failed undef unknown `-+- policy='round-robin 0' prio=0 status=enabled |- 7:0:0:39 sdx 65:112 active undef unknown `- 4:0:0:39 sdk 8:160 active undef unknown 36000144000000010f01c857894aedd26 dm-14 EMC,Invista size=5.0T features='0' hwhandler='0' wp=rw `-+- policy='round-robin 0' prio=0 status=active |- 7:0:3:94 sdba 67:64 failed undef unknown |- 4:0:3:94 sdad 65:208 failed undef unknown |- 7:0:4:94 sddb 70:144 failed undef unknown `- 4:0:7:94 sdcg 69:64 failed undef unknown (...) Running multipath -f dm-5 or multipath -w 3600601602bd14600351eb55f237aa77d does not delete the entry, not even after running multipath or restarting the multipathd service. These entries are not present in /etc/multipath.conf. How to delete the failed entries?