So i'm starting to collect kegs to build a 3 tier system and I got a good deal for a old Sanke off craigslist today. Somewhat strange, however, as some of the top is cut off (not for brewing purposes) and is really filthy inside. There is some rust around where the previous cut was made and it looks covered in rust inside, however when i rub with my fingers it seems to wipe off easily. This keg could be anywhere from 1 to 10 years old, as it looks as though it has sat in a dirty garage for some time considering the amount of cobwebs and whatnot.
So my question is where do I start in cleaning this badboy up? It's really dirty and I hope it's not unusable due to this, since what appeared to be rust wiped off rather easy. I've posted a few links to pics below (sorry for the iphone camera quality) so let me know what you think! Will Barkeepers friend and oxyclean followed by a few boils get this guy to usable condition?
(sorry, tried to show rust on where the previous cut was made but doesnt show well. I will be making a new cut so I have a bigger hole so this shouldnt really be a problem)