How Do I Stop the Corrosion?

Speedy is now four months old and has only done 3000km of mostly fair-weather riding. It lives tucked up in my garage, safe, sound and dry! It gets treated to a wash and polish each week, carefully dried in the warm late-afternoon sun.

And yet...

Over the past few weeks I notice that the bright polished aluminium that support the rider and pillion foot pegs are showing serious signs of deterioration -- aluminium oxide film forming on the metal surfaces particularly in the corners and crevices.

How can I stop the rot? Has anyone else experienced this problem? Should I have the parts bead blasted and lacquer coated? Maybe someone could give me some better advice, based on experience?