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So I forgot to brush off fertilizer I used for my lawn on my driveway and sidewalks. I've tried CLR rust removal (it said I could use it on concrete), with pretty much no result.
Everything online says I simply have rust on the concrete (especially since I bought a high iron fertilizer), so what products do you use to get rid of these stains and how do you use them? I have a lot of concrete basically sprinkled with these stains, so a large scale solution would be greatly appreciated.
This is a decent approximation of my problem, just more clustered and deeper orange.