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Sounds like steel dust from a grinder. If you wash/brush it off immediately, there is usually no problem but if you let it get wet for just a little while, it stains brown. Acid does the trick.
If it was overspray it would be raised. If it is some kind of fallout it would be a stain at best, a chemical attack which would have caused pitting as worst. When i worked at refinery in gladstone we used to have to wash the cars with acid so you could see out the windows. I know using acid to get it off means it would have been alkaline based. a number of industries use caustic based solutions from water treatment to paper manufacturing. It will leave a yellow to red stain.
Not an expert but a possibilty
For the record mainly dust in Gladstone but industrial fallout is not uncommon. Reel Nauti ive had stuff that does not wash off. Coal dust does not just wash off. Caustic fallout does not just wash off. But i moved there knowing the industries were in town so no whinging.
Pete, fair enough..... could be anything up there... I've had molten metal from grinding a few times, and it's a bastard, will rust again after some time.
Do you have any pics of the area?
If it's rusty, is your haines orange? May get a good color match out of it
boatboy had seafear acid washed then was supposed to be polished and waxed left boat very dull and looked like it was left out in yard all its life and payed top dollar for it was very pissed off mate
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