If the noise is louder than the show, you have two options. You can do it manually where you zoom into each blue wave pen sound (it will stick up), drag-select it and mute it with Control-L. Or you can go to a Nyquist plug-in and try to do it automatically.
If you are the adventurous sort, you could try Effect > Noise Removal, too. That might need a little bit of editing on your part.
Cut the presentation (temporarily, make a backup copy of the show) until you have several of these clunks by themselves on the timeline. Drag-select them and use them as the Noise Profile step in Effect > Noise Removal.
Then apply Noise removal to the unedited copy of the show.