Need suggestion regarding drop RAC database of 11g

Hi All,
I have 11gR2 RAC environment setup. Database required recovery and I have no backup, based on support engineer guidance I restore the database using some hidden parameters though its a corrupted db so I need to rebuild. For rebuild purpose I took expdp of entire database and then drop it. I had drop through "dbca" , db was open and I run "dbca" and select drop database option, at one time it showing me warning/error ORA-01586:database must be mounted EXCLUSIVE and not open for this operation but after that drop was run perfectly.
but when I check the ASM disk status , it still show as it is , I mean no change in their free_space column, I also verified through asmcmd command and all the Datafiles are still there.
I want to cleanup asm disk which are still fillup with dbfs and I thought that would be cleared by dropping database but no my assumption was wrong.
can any one suggest me what to do if I want to make free space in asm disk which was allocated for dbf files?
Thanks in advance.

Hi Forstmann,
Please find both the commands output below:
ASMCMD> lsdg
State Type Rebal Sector Block AU Total_MB Free_MB Req_mir_free_MB Usable_file_MB Offline_disks Voting_files Name
MOUNTED NORMAL N 512 4096 1048576 14004 13208 0 6604 0 N ASM_FOR_CRS/
MOUNTED NORMAL N 512 4096 1048576 75069 19755 18440 657 0 N ORADATA/
MOUNTED NORMAL N 512 4096 1048576 200060 199773 74 99849 0 N ORADATA_PROD/
MOUNTED EXTERN N 512 4096 1048576 99998 48689 0 48689 0 N ORAFLASH_AREA/
MOUNTED NORMAL N 512 4096 1048576 106013 105823 0 52911 0 N TEST/
ASMCMD> find + *
+ASM_FOR_CRS/
+ASM_FOR_CRS/RWCORA-cluster/
+ASM_FOR_CRS/RWCORA-cluster/ASMPARAMETERFILE/
+ASM_FOR_CRS/RWCORA-cluster/ASMPARAMETERFILE/REGISTRY.253.725970931
+ASM_FOR_CRS/RWCORA-cluster/OCRFILE/
+ASM_FOR_CRS/RWCORA-cluster/OCRFILE/REGISTRY.255.725970933
+ORADATA/
+ORADATA/ASM/
+ORADATA/ASM/CONTROLFILE/
+ORADATA/ASM/CONTROLFILE/ctlbkp-23FEB.334.743838771
+ORADATA/ASM/DATAFILE/
+ORADATA/ASM/DATAFILE/SYSAUX.260.726054695.bkp.336.746443183
+ORADATA/ASM/DATAFILE/SYSTEM.259.726054677.bkp.335.746443047
+ORADATA/ASM/DATAFILE/UNDOTBS1.261.726054711.bkp.338.746443879
+ORADATA/ASM/DATAFILE/UNDOTBS2.263.726054721.bkp.339.746444613
+ORADATA/ASM/DATAFILE/USERS.264.726054727.bkp.337.746443729
+ORADATA/ASM/PARAMETERFILE/
+ORADATA/ASM/PARAMETERFILE/spfile.267.726056723.orig.324.731752409
+ORADATA/ASM/PARAMETERFILE/spfileracdb_08DEC.ora.333.737181947
+ORADATA/ASM/TEMPFILE/
+ORADATA/ASM/TEMPFILE/TEMP.262.726054713.bkp.340.746444645
+ORADATA/CMDOC
+ORADATA/CMDOC702
+ORADATA/CMDOC702RAC
+ORADATA/DM_CMDOC702RAC_INDEX
+ORADATA/DM_CMDOC702_INDEX
+ORADATA/DM_CMDOC_INDEX
+ORADATA/RACDB/
+ORADATA/RACDB/CONTROLFILE/
+ORADATA/RACDB/CONTROLFILE/Current.256.726054673
+ORADATA/RACDB/DATAFILE/
+ORADATA/RACDB/DATAFILE/JISPCARS.dbf
+ORADATA/RACDB/ONLINELOG/
+ORADATA/RACDB/ONLINELOG/group_1.257.746533235
+ORADATA/RACDB/ONLINELOG/group_2.258.746533237
+ORADATA/RACDB/ONLINELOG/group_3.265.746533239
+ORADATA/RACDB/ONLINELOG/group_4.266.746533241
+ORADATA/RACDB/PARAMETERFILE/
+ORADATA/RACDB/PARAMETERFILE/spfile.267.726056723.orig
+ORADATA/RACDB/PARAMETERFILE/spfile.267.737185455
+ORADATA/RACDB/PARAMETERFILE/spfile.325.731754029
+ORADATA/RACDB/PARAMETERFILE/spfileracdb.ora
+ORADATA/RACDB/TEMPFILE/
+ORADATA/RACDB/TEMPFILE/TEMP.262.726054713
+ORADATA/RACDB/TEMPFILE/TEMP.262.726054713.bkp
+ORADATA/RACDB/TEMPFILE/TEMPS1.341.746954959
+ORADATA/RACDB/TEMPFILE/temps1
+ORADATA/RACDB/ctlbkp-23FEB
+ORADATA/RACDB/spfileracdb.ora
+ORADATA/RACDB/spfileracdb_08DEC.ora
+ORADATA_PROD/
+ORAFLASH_AREA/
+TEST/
total 68 dbfs.

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