In article .com,
says...


I used to store my boat near a RR trestle and every spring would have
to remove freckles from the deck caused by minute steel molecules. We
all used dilute muriatic acid very carefully.

Muriatic aciud is the very best. Put it on the rust spot, let it rest a
bit and flush away with plenty of water. It converts the insoluble and
red iron oxide to soluble iron chloride.

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??