To completely remove all the changes made by a revision, click the Lease menu at the top of the screen, and choose "Undo Last Revision." You can choose this multiple times to remove several revisions (all the way back to the first, if desired).
Note: This does not undo descriptive changes, which are not stored as revisions but are maintained once for all revisions. This also does not undo changes to AROs, which have their own method of undoing a revision.
Related Links:
Revisions (Modifications) | Revise vs Replace | Revision booking date