Clean Reflector

If greasy, with alcohol. If it has calcium deposits, I'd say vinegar, although it might become permanently hazy.

Microfiber cloth, like you use to clean glasses.

I use windex's "green" glass and surface cleaner and paper towels. I spray the reflectors and let them sit for a minute then wipe it down then go over it a second time to reduce smears.

Cleaned mine today with paper towel and water. I was afraid of using any cleaning chemicals.

i use some vinegar to do a clean rinse with water, then polish them to perfection with some Meguiars Mag Wheel & Aluminum Polish