If it is due to iron, I'd mix up some OxyClean (powder) with water (about 1 scoop/gallon) and using a pump up sprayer, spray it on the area then rinse off in 4 - 5 minutes. If it is iron you'll see it disappear before you can wash the area with clean water. You can find it in the laundry detergent aisle. You can use the rest of the OxyClean in your washing machine to give your detergent a boost.
As with all chemicals, wear gloves and especially if spraying use eye protection.
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