**Wont hurt anything if you leave em alone either.** agree with this..Take a green scotbrite or dishwashing pad and cut into strip wide enough to fit journal and polish. Wont hurt anything if you leave em alone either.
my crank was a mild chocolate color also (But Smooth.!)
Leaving it alone..
the sanding with fine is ok... but you need to get all abrasion debris out of journal lube holes and hiding spots. (most cant do that properly)
so to me the reward for not scored surface is not worth introduction of grit in the mix of a rebuild.
nothing wrong doing this just care needs to be taken.
but me personally if not scored wouldn't mess with it.
now if we were talking rings and pistons seating... yes cross hatch. as mentioned.(for sure)
220 not gritty enough to cause severe damage if not cleaned and removed, but on rebuild I am trying to keep foreign debris out.
just my .02 cents
everyone that has replied thus far has given good advise and knows their stuff.