Sandblasting
I have used a local guy here in Williamstown but he charged like a wounded bull and was unreliable.
In desperation I bought myself a large petrol powered high pressure washer with sand injection at 1300 PSI. Works a treat and no dust. If you do it in an area where the sand can dry its even recyclable.
Don't forget you need to treat the resultant bare metal straight away with phosphoric acid or similar.
Graeme
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