Cleaning a metal stain

Azmp1

0
LifeTime Supporter
Jul 20, 2012
328
Maryland
Folks, a quick check, was using a metal brush to clean some calcium residue off a raised beam and didn’t notice few metal bristles falling into the pool. Stayed there overnight and just like that I know have rusty metal stains where the bristles landed onto the plaster.
What is the best way to clean that up? I don’t think the chlorine tablet will work since these are inorganic stains?
Thanks.
 
Vitamin C tablets in a sock. Crush them up a bit and let them sit for a few minutes on the stains.
 
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