Macbook Air Aluminum Wearout As you can see in the pictures bellow, this is the palm rest wear I have on my Macbook Air after 1 year of (heavy) usage. I use my laptop professionally, almost on a daily basis for many hours a day. This is the result after cleaning the whole case with a cleaner I purchased from the Apple Store. As you can see it does not really help remove these stains, it does work wonderfully for all other stains... but I'm afraid this wear is actually removing part of the aluminum cases surface, if I'm right, I guess there's not much hope in restoring the finish. I would like to know if anyone else has experienced this and what you have done about it if you have been able to fix it. Thanks!
Not that it will help, but that looks like a 2-coat process, as it's wearing away, the 'outline' is the border between the top coat &amp; the substrate; the patch in the middle is where that base coat has also worn away.  

In short, I'd say not fixable, other than by completely stripping &amp; re-coating... or not viable, rather than not fixable.

moved from comments

Anodization changes the microscopic texture of the surface and changes the crystal structure of the metal near the surface. Thick coatings are normally porous, so a sealing process is often needed to achieve corrosion resistance. Anodized aluminium surfaces, for example, are harder than aluminium but have low to moderate wear resistance that can be improved with increasing thickness or by applying suitable sealing substances.