ok..I have done aluminum fuel tanks on trucks looking like your running boards..I used Duragloss AC (Aluminum Cleaner & Brightner) and it worked good....it may work on the running boards...worth a shot....try a carquest near you to see if they can get it for you..its about 7.50 a bottle.......
Duragloss AC (Aluminum Wheel Cleaner) is a blend selected acids and surfactants that easily removes brake dust, oil and road film from dull and semi-dull aluminum wheels. Can also be used on other aluminum surfaces such as pontoon boats, tankers, etc.
it does clean aluminum pretty good.....will not harm the rubber....
AL
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