Never had a problem cleaning a sanke keg. That myth about them is so overblown and false IMO.
I use a cheap nail file and pliers to remove the O-Ring. (in the photo I am referring specially to the top right corner where the nail file curves - that "tool" on the nail file is the key to it all)
When I put the O-Ring back in, I use needle nose pliers again and the same type of grip wrench that's shown in the youtube video above.
After you remove and replace the O-Ring about 5 times, it's like riding a bicycle. I use sanke kegs for my entire setup because my I like taking my pony kegs to family events, parties, etc.....Not to mention the homebrewer hobby has absolutely driven soda kegs to the point where they are usually more expensive now than commercial/sanke kegs. I'm absolutely satisfied using sankes and would never switch.