CRINGING!!!
If you haven't already removed the anodized coating with abrasives (sorry, my brain shudders at the thought), try to rub a bit of "rainchalk" on the anodized surface. It is available from Midwest Turkey Call Supply. I used it on my personal anodized call for a couple of years with great results. Just rub a bit of the rainchalk on to get a "hazy-white" appearance. I found that my strikers gripped again almost as good as a new surface.
A side note - anyone that has worn the textured anodized surface smooth on one of my calls - I will replace the surface for the cost of the material and shipping. I did this on my personal anodized aluminum call after about 4 years and it runs like a new one again.