As you install, uninstall and update applications there are some garbage left behind.

Autoremove⌗

When you run autoremove, packages that have been installed but are no longer in use, are removed.

sudo apt-get autoremove

Autoclean⌗

Autoclean removes .deb files from packages no longer installed on your system.

sudo apt-get autoclean

Do you have other cleaning tips? Send me an email or post a comment.