If you use granular lawn fertilizer most of them have some iron in it and if not blown or swept off the pavers they will stain them. Can also get it from water dripping from a rusted are under a vehicle and some water has iron. I take my spots of using a thin cutting wheel attached to a drill and just lightly touch the spot with the surface of the wheel, comes right off and you will never know it was there. there are other ways but this is the easiest and quickest.
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