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Reveal hidden Mac OS X files
Lots of apps leave a legacy of activity, clean that shit up!

Open Terminal found in Finder > Applications > Utilities

In Terminal, paste the following: defaults write com.apple.finder AppleShowAllFiles YES.

Press return. If theres no error you are done with the terminal now.

Hold the 'Option/alt' key, then right click on Finder in the dock and click Relaunch.

Voila

There is a library directory for the mac itself and your user.

Now check the subfolders for application remains and delete. Here is list of the most common relevantt directories.
~Library > Application Support
~Library > Caches
~Library > Logs
~Library > Preferences
~Library > Containers
~Library > Cookies
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