Solved! Simple, fast delete of files and folders from Buffalo NAS

I'm on a Windows 10 laptop, with my Buffalo NAS mapped as a drive. But deleting files and folders is a bear if you're using File Explorer. It can take days.

Solution

1. Go into your Buffalo Admin panel
2. Advanced Settings
3. Webaccess Settings
4. Find your BuffaloNAS.com Name and BuffaloNAS.com Key 
5. Go into the BuffaloNAS.com server 
6. Type in your BuffaloNAS.com Name (I didn't seem to need the key)
7. Sign in as admin
8. Be careful that you are only deleting files you are sure you want gone. 
9. It takes only a few minutes, at most
10. Don't forget to empty the trash, too

Never delete from your NAS device with File Explorer ever again!