Cleaner for Xcode needs permission clean files
You don't really need a separate app for cleaning Xcode files. I frequently do it manually, when the build logs are old, irrelevant. You can navigate to that ~/Library/Developer folder and remove what you don't like. Be careful not to remove UserData or you'll lose your preferences. I remove simulators because I don't need them. 


Reduce size of the Xcode application


I also set the iOS DeviceSupport folder as locked after cleaning it up, since it eats 2.5 GB for nothing. 


How to stop Xcode downloading iOS support package of my iPhone?