Royal Oak - Regular Cleaning Regiment?

[Speed]

Sorry - Regimen.

OK. Dumb question. Not as dumb as "What is the average discount I should received on a stainless steel Rolex" or "Is it safe to wear my expensive watch in _____ City, Country etc...

Now we know (after numerous comments from Padi) that the best way to clean a Rolex SS sports watch is with a soft toothbrush and gentle soap / warm water. No Veraet / fancy watch cleaners required.
Same for a Royal Oaks? 15300 / 15400 / 15202?

Reason I ask is I know the fine brushed surfaces can scratch if you look at them funny. Would a garden-variety toothbrush mar the fine brushed surface of a RO?

What do folks to do in terms of regular cleaning?

Thanks