Is there an app that cleans up old uninstalled apps preferences from the system and User Library's? I already use OnyX, MainMenu, XSlimmer and other various apps to keep my MAC running at best performance. But when I browse my Library's I see preferences for apps I don't have anymore. Instead of manually going through them all is there an automated app that looks in my Applications folder and then my Library and figures out what should stay and what should go. Also looking in /Library/Receipts/ there are also pkg files left by uninstalled apps. I know CCleaner does something similar with the Windows Registry. What MAC App will clean these left behind files? I use AppZapper now but I need something to clean before I learned about AppZapper. Thanks in advance for any help!