Obliterate is used to permanently delete reviews that have been created by mistake. For instance, if a review is associated with the wrong changelist, or a review contains sensitive information that should not be openly available.
For information on what happens to a review when it is obliterated, see When you obliterate a review.
Obliterate must be used with care, the review and all of its associated metadata are permanently deleted. An obliterated review cannot be reinstated, not even by Perforce Support.
To obliterate a review: