I need to completely reinstall Xcode 6 and remove all the files and settings with it.
I know that it is uninstalled so that you go to mission control, long click on it and then click on the X button, like on iPhone.
I also know that you can drag it to trash from applications.
But after all those, when I install it again through AppStore and open the last project I was working on, Xcode will open the project on exactly the same class where i t was shut down and even show the last error I faced!
I don't want that. That means that some User Preferences are still saved somewhere and I want to get rid of them as I have never ever had Xcode installed on my Mac.
How to do that?