Unfortunately, or fortunately , depending on how you look at it, I saw this problem coming and opted for the running board replacements that are just 3" diameter Stainless Steel tubes, with the rubber treads stuck-on. Very easy to clean and any scratches can be polished-out, within reason..
Presumably, as people are recommending abrasive cleaners, the "standard" running boards are not plated in any way? In that case, regular (slightly) abrasive cleaners are the only solution. If they're Aluminium, CPC sell some very good Aluminium polish that will bring it up like chrome.....the problem is you have to keep it that way.
Maybe try the heavy-duty wax that's designed for alloy wheels?
ML350Cdi BE now replaced, E220 2013MY just for a bit.....
On mine (2010) it had the alloy finish with hundreds of rubber dots/ovals, and I found it was just as easy to use a good tyre finisher (aerosol) on them, get them well covered and then a rub over with a brush and cloth.
The alloy will always look a bit tatty though, just not a good finish on them.
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