+1 for the Teflon spray, to be honest I've never found a reason to use a lube on any of my CF tripods, but the Teflon spray is great, it is a dry lube and will not gum up and doesn't attract any dust or dirt,
Gitzo sells grease in a tube for this purpose - see THIS. That is what Gitzo uses at their factory.
One posting noted that using greases other than the Gitzo can result in the tripod locking up for good if exposed to salt water. Yes it is very expensive for what you get, so don't bother with stating the obvious.
Really Right Stuff recommends the use of Phil Wood Tenacious Oil. It is sold by bike stores.
The RRS tutorial on tripod maintenance can be found HERE.
I've been using silicone dielectric grease for years, with no issues on 6 or 7 Gitzo's. It's cheap and readily available in any auto parts store, in single-use foil packets or tubes like toothpaste. I have actually tried the Tenacious Oil, but I'm in south Florida, and it runs in very hot weather (and I applied it very sparingly).
I can understand the problem with grease and sand/dust. I was in Arizona earlier this month and after a couple of days the joints started to make a horrible screeching noise and it was so difficult to tighten it. Came back home and opened and cleaned the joints. Hence looking for grease. If something else works, then I want to go with it.
I smear silicone grease on the alloy leg (internal & external) parts of my CF tripods that I use in the sea. I also pack the twist locks full of grease, working on the assumption that if it's full of grease they can't be full of salt water. I also strip the pods down after two or three times of use.
