Something I happened upon by sheer accident
Don't know if this will work in other browsers...I use Firefox...
After you've got your drop-down menu there...highlight the top one...hold the Shift key down...and press Delete...
It should automatically scroll deleting almost everything in it's path...I have 6 entries left that wouldn't delete on the first try.
Eg
OH...make sure you've high-lighted an item in the drop-down menu not the search box...I did that and the box disappeared... but got it back on a refresh
