O, that is easy question. For camera related things, like cleaning old grease nothing beats Ronsonol - lighter fluid.
For lubricating - white lithium grease, you can buy it in Home depot.
Don't go crazy with it, less is more! Also take detailed, close up pictures of all your steps if you take thing apart.
If you like to go fancy there are special camera/lenses lubricants at http://www.micro-tools.com