How to delete and Maintain these tables VBDATA, VBHDR, and VBMOD in unicode conversion

Hi Experts,

While doing Unicode conversion on MSSQL and the OS is Windows server edition, I want to know how to clear the entries in the below mentioned tables

1. VBDATA

2. VBHDR

3. VBMOD

I have tried through report RSM13002 also but couldn't clear the entries on the above mentioned tables.

Kindly suggest and do the needful.

Thanks,

Narasimhan Krishna