Contractor left me a metal mess

Jun 9, 2015
23
Saint Marys, PA
Had some work done on a chimney that required grinding of joints and rubbing with steel wool . I now see on my white steps some rust spots that appear to be from steel wool or grinder disc. I have started some treatments with A-Acid powder ( C ) but not really 100% positive results . Will vacuum today and try again but any other suggestions
 
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