How to polish Wilson Audio speaker

Your Wilson's should come with a micro fiber cloth.  Wilson recommends periodic wiping of the speakers using a horizontal wiping motion to avoid swirl marks.  You do not need to wax your speakers as they are not exposed to toxic environmental elements and sun like a car.  For finger prints etc, Wilson recommends a product called Plexus Plastic Cleaner which is safe for painted surfaces.

Dust lightly with Swiffer, then use a soft microfiber cloth and an auto detailing spray like Griot's Garage speed shine.  As stated above, clean in straight lines to avoid round swirl marks which are more visible. I believe Wilsons use automotive paint and you can find a lot of information in auto detailing videos, especially ones for dark cars.   

I use muriatic acid and sandpaper. 

I kid. Enjoy your new speakers!

+1 for Lak's comment.
B

Here's what an account service manager from Wilson Audio had to say: 
Hi, Yes we use an automotive paint process, base coat/ clear coat. Anything safe to use on an automobile is safe to use on our speakers…
As you may surmise, there are some excellent detailing products out there for cars. Pick your favorite….I would be cautious with a powered polisher unless you know what you are doing, you may burn through the clear and base coat…
We use the 3m micro fiber cloth rags….I would use a rag that you’ve known to work well with automobiles as well.
Best Regards,

Plexus Plastic Cleaner or Meguiars Ultimate Polish works best, do 3 times a year and periodic microfiber cloth dusting.   If you have micro hairline scratches or hologram scratches it involves cutting, buffing and polishing by machine but be careful you don't want to burn through the clear coat.  Sophia 3 are amazing aren't they?  They seem to sound better scratch free ;-)