I used a combination of SEMICHROME polish and also MOTHERS, the mag and aluminum cream polish in the jar. I started restoration on these by first giving them a clean up with Gunk engine degreaser. Then the CLR calcium, lime and rust remover. Then straightening the tangs around the wheel cover with a lineman's pliers. Then the polishing begins. Countless hours on the floor in front of the TV with blackened hands and piles of black rags and the chemical smell waffting through the house. How I spent winters in Minnesota. The crests, the crests! If you ever have a chance to see some side by side. The crests I located for all my wheelcovers are heavvily cloissoned, and the chrome is thicker than the other ones out their. I notice the difference and every wheelcover I ever by gets the crests swapped out if they are the cheap ones. The wreaths for these wheel covers I have only seen available from one source and they were very expensive. So only thing I did not do, was take the covers apart to silicone a couple of the loose spokes. But those can be done from the face side as well. Lots of hours in each wheel cover.