You can use concrete rust stain removers that are readily available at home improvement centers.
Iron fertilizer stains on concrete.
Iron fertilizers contain iron sulfate which can stain your walkway.
Singerman concrete rust remover works extremely well at getting rid of rust stains on concrete including those caused by lawn fertilizer.
Water causes the chemical pellets to basically soften on the concrete and therefore the properties inside the chemical will cause deep rust.
Use this to remove the rust stains https amzn to 2utvyxl.
Super easy to use does not have a strong odor or harm your hands it s sealgreen.
You might have known that.
How to remove fertilizer rust stains from concrete.
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Many consumer fertilizers today contain a small percentage of iron a mineral your lawn needs to stay healthy but which your concrete certainly doesn t.
These stains are caused by chemical fertilizer granules that are left on concrete surfaces.
I found a product that cleans fertilizer stains from concrete.
Not all fertilizers have iron but it does get your grass really green.
Sometimes a fertilizer bag can cause a nasty stain when placed on a concrete walkway.
This may sound weird but fertilizer really can leave rust stains on your pristine concrete.
The iron in the fertilizer is what causes rust.