There was grease added, no problem. What I have done is that I have taken it all apart, which means that I have the half shaft separately and cleaned out both ends totally. Why? Two reasons.
No1. There has been a leakage of dirt water into the end, which sit at the wheel end. I did not want to have grease mixed with dirt. It is abrasive and will sooner or later destroy the complete end.
No2. I had new half shafts made in the same material as what they use in a Racing car. Reason? Fun and my company manufacture that type of material.