I was told by the makers of our sunroofs that a SMALL amount of graphite is best for the lubrication on the moving parts.
To get to your front tubes, just put the roof all the way to the back (open position, instead of vent position). It appears you will have to remove the glass to see the rears, though. Pour some water in the "funnel" that heads toward the hole at the corner and wait to see if water shows up under the car. If they're clean like mine, you'll see and hear water there in a few seconds. Front tubes drain near the rear of your front wheels.
