I just tested a few of these, using Skype.app as the file to be deleted.
AppZapper found 4 items
AppCleaner found 6 items
AppDelete found 9 items
EasyFind found 16 items
Finder found 17 items
While this thread is a few months old, I'll add this for those who might find it in a search:
To manually remove an application and all associated files:
- Launch Finder and search for the app name (hopefully unique, such as Skype)
- You can narrow the search to specific folders or search your whole Mac
- Searching "File Name" vs "Contents" usually provides better results.
- Click the + button below the search term to add criteria
- Click the search criteria drop-down and select "Other...", then "System files"
- Click the "don't include" and change to "include"
- Sort by name, kind, date, etc. to identify components of the app, such as folders, .plist files, cache files. etc.
- Delete all files and folders related to the app.
- Don't empty your Trash until you've determined that everything is working OK, in case you need to restore something you deleted by accident.
- A reboot might be necessary to completely remove some apps.