Anodized alum can be a pain in the butt to get to play. It depends on who did the anodizing on it? I've gotten some that play fantastic and the next batch won't play at all. I've tried alcohol, scotch brite pads, emery paper, sandpaper, steelwool, dawn dish soap, and vinegar on them. If they are an anodized surface I've found the best was to wipe it down with vinegar and let dry, then clean it with alcohol wipes. Vinegar has an acid in it that etches into the anodizing, then wipe it down with an alcohol pad to clean it good. Make sure your striker tips are clean, I use 100 grit sandpaper to clean them with because it scufs the tips up good. Try it before you use any course scuffing paper on it?