But it's very easy within UVS7 - change to timeline mode , ensure project (not clip) is highlighted - play the video until the start of the adds - stop the video, the timeline will jump to the point at which you stopped - adjust the blue triangle cursor to the exact point to cut, click on the pair of scissors. select project again and continue playing the video to the end of the adds - stop the video, again adjust the blue triangle cursor to the exact point, click the scissors again, This will usually leave you with the adds bit selected - if not just click anywhere on the adds section. Hit Delete on your keyboard - there you are adds gone.
If the wrong bit vanishes simply hit the Undo icon and try again