Open the Steam app → Library → select the game you want to remove. Click “Support” on the right part.
How To Completely Remove Steam Games Mac Downloads
Check the website to see how to uninstall it. If you can't find it...
Drag the application to the trash.
Go to ~/Library/Application Support and trash the folder the goes with the game.
Go to ~/Library/Cache/ and find the cache that is the same or similar to the game name and delete that. (You will probably have to secure empty the trash.)
Go to ~/Library/Preferences/ Find the file name and this time it will end in .plist. Delete the file. This is the file that holds all of the preferences for the game.
How To Completely Uninstall Steam Games On Mac
Jun 2, 2011 2:51 PM