Antichrist nailed it.
I flushed out the swivels with the same method. Filled with paraffin spin the wheel around a bit. I do this a couple of time and let dry out. However I have never used the Grease. I would rather have the CV sitting in a bath of oil and repair seals if they leak. I always refill up to the full plug with a 50/50 mix off good Synthetic 90w and Lucas oil. Great product very slick also reduces leaks I used their product all over the truck Steering, Gear and transfer box, diff the lot. Never had a problem.