I think this should work:
1. Browse-->Baseball
2. Click on Teams
3. You'll have to do a few as an Angels collector (LA/Anaheim/California), but click on a team
4. Click on Collection Summary
5. Click Add/Update wantlist
6. Click Filters
7. Filter by "AU*" (the * is important as that'll include cards with AU notes plus any other notes)
8. Click Choose an action... --> Remove all cards from wantlist
Do that for the other instances for the team as well. I don't know if that'll get everything depending on incorrectly formatted notes, but that should go a long way towards doing what you want, I believe.