I have an outdoor patio on the second floor which receives runoff from the shingles. It has been stained horribly over the past 3 years with this rust colored buildup all over it.
I tried using a pressure washer and it couldn't cut through the gunk to remove it. I bought RustAid rust stain remover (outdoor), poured it on, let it soak, and tried to remove, no luck. Anyone have advice or success stories about removing this type of stain? The patio has a type of linoleum roll used from the best I can tell.