Classic/Antique Car Repair: 68 elcamino, cast aluminum valve, aluminum polish

Question
What is the best thing to use to polish cast aluminum valve covers?

Answer
Hi Kirk:
Absolute best product for aluminum, "Mother's Aluminum Polish". I use in on my aluminum bumpers and they shine like chrome! Be aware, it may require several applications to remove all the tarnish. Get yourself lots of old clean rags. You will be amazed how much tarnish is going to come of.