Simply get some oxalic acid or a teak 'brightener' containing oxalic.
Some 'cleansers' also contain oxalic: Zud, Barkeepers Friend, etc.
Oxalic acid will dissolve the rust stains faster than you can spell or
say "oxalic acid".

In article .com,
Chris wrote:

Hi Sailors,
I just had my decks emroned with a sand mix for no-skid areas and the
boat look great, however when a worker drills metal somewhere the tiny
shavings blow onto the decks and ultimatly become these hard to clean
rust dots...

Any luck with non skid deck cleaning materials??