title: What does XCode 'Clean' actually do?
body: <p>I always choose to 'Clean' my project before archiving it in my XCode projects, but I don't actually know what it does.</p>
  
  <p>I've searched the Internet and can't find the answer either.</p>
  
  <p>If anybody knows could you please post it here?</p>
  
  <p>Thanks everyone</p>