From the Aluminum Anodizing Council: 1) No acids or caustics. 2) No chlorinated solvents. 3) No hard rubbing with coarse abrasives; the finer grades of Scotchbrite pads or Pumice powder are OK, sandpaper or steel wool are not. One recommended technique is to use an abrasive cleaning sponge with mild dish washing liquid. 5) Mild soap is preferable to detergent for routine cleaning.
There is a product called Everbrite that we use to restore the color on anodized window frames that seems to do a good job of restoring the finish. We get about 7 years on store front windows. A little less on door frames. In a high UV salt environment you will probably get less.
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