Had my rack replaced, along with the high.

Had my rack replaced, along with the high pressure hose, but still getting the same grinding sound as before I had the repair. I have had 2 mechanics look and assess the same issue, and that I needed a new rack and hose. Now that these have been replaced and I drove it for a day, I still have the same sounds. I was advised there was a lubricant that may help relieve this issue or any other ideas on correcting the rack noise?