What is the grill made of? How do I clean/polish it?

 

I believe that's also "aluminium."

 

Yeah, I think so too.

 

A mild paint cleaner will do a good job of polishing the front grill:

http://www.glisteningperfectionstore...Cleaner/Detail

If there's oxidation or water spotting, then a metal polish such as P21S will do the job:

http://www.glisteningperfectionstore...r-metal/Detail

1. Dab a little polish on a soft microfiber cloth
2. Begin rubbing and working the polish into the metal. You may see some black on your towel. That's OK.
3. With another towel or a clean potion of the same towel, wipe off polish residue to a brilliant shine

Hope this helps