Use the following menu command: Edit -> Add to Select Set -> Teardrops and then hit the delete key
Added after 11 minutes:
Also, here is what the help file says when I did a search for teardrop:
To Remove Teardrops
All teardrops in a design can be selected using the Add to Select Set - Teardrops command, and then they can be removed by using the Delete icon on the toolbar or by the Delete keyboard key. Selecting a teardrop and then selecting the delete key removes individual teardrops.