Although the Mac OS platform is known for its simplicity in removing applications, by just the mere 'thrashing' of its single application file, nonetheless there are application files of some applications that will still 'linger' around way after the main application file has been deleted, ala the Windows platorm.
And this is where the freeware application called AppZapper is a godsend. Installing it is a breeze, and it doesn't take a huge amount of real estate space in your hard disks. Just activate it, move the required application that needs to be removed into the windows (see picture), click ok to remove all of the removed application's files, and walla, all is done. Try it!