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[email protected]

wrote:
Got a normal concrete patio...a couple of places where some metal
objects were placed now have some rust stains (grill, my charcoal
starter chimney, etc). Is there a chemical I should use? Rent a power
washer maybe?

if they are not too bad , sweep up any loose debris or dust , tyhen try
some CSR or similar product. If it dissolves the rust stain , hose off
, or flood with lots of water .