1. Press Command + Shift + K -> this is for normal Clean.
2. Then Command + Option (alt) + Shift + K -> this is another kind of cleaning, something like cleaning the build, I guess.
1. Press Command + Shift + K
2. Then Press Command + B -> normal Build.
Oh, I'd like to say that I feel like I've mastered Certificate Stuffs and Provisioning Profile Stuffs in iOS Development.