Android obfuscator

Hi, I’m looking for free obfuscator for my android/C# game. I need to be easy to use or not so easy but I need tutorial. I’m using some android native plugins like: admob, google play services and some more, I need to obfuscate the plugins too ? or when unity compile the Project is obfuscate ?

Dunno of free ones, but this one is good Unity Asset Store - The Best Assets for Game Making