Everybody is here is focusing on "sanitizing" the keg and lines, but the title is "cleaning" Kegerator stuff. All the sanitizer in the world won't clean kegs and beer lines. For that you need something that cleans. OxyClean works, as does PBW and many other products. StarSan, C-Brite, bleach, and Iodophor aren't cleaners.
Cleaning is important. All the good sanitation practice in the world won't help you if the stuff isn't clean before you start.
Think about it: you can't sanitize dirt.