reorg to remove forwarded rows on partitioned tables

We have a datarows locked table with partitions. We have 3 indexes on the table

     1 unique clustered (local)

     2 non-unique non-clustered (1 local and 1 global)

systabstats shows one of the partitions has forwarded rows and deleted rows...

ie

        select  object_namests.id, sts.indid, sp.name, sts.forwrowcnt, sts.delrowcnt

        from    systabstats     sts,

                syspartitions   sp

        where   sts.partitionid = sp.partitionid

gives

                                     indid                       forwrowcnt           delrowcnt

      ------------------------------ ------ -------------------- -------------------- --------------------

      ETP                                 0 p20                         111260.000000        555628.000000

I ran

     reorg reclaim_space ETP partition p20

and the delrowcount reduced

I tried

     reorg forwarded_rows ETP partition p20

but the forwrowcnt remained the same.

I tried running this on all the partitions - no change.

I tried

     reorg rebuild on the clustered index partitions  (didn't expect this to work but tried it just in case)

I tried

     update statistics - just to check

Nothing I've tried will remove the  forwrowcnt          

Am I doing something wrong ?

Is a rebuild on the whole table the one way to remove the forwarded rows ?

Its a large table so not easy to do this.