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Searched through the forum and can’t seem to find anything similar. This surface has been covered in dirt for a very long time, I pressure washed it and got it to this stage and don’t know what to do about the orange staining on it. It is only stained on the areas that are covered by the verandah, the outside edges that get rained on don’t have the staining. Any help would be appreciated.
could be rust, mineral stains from the dirt, or phosphate stains.
Id try simple HW mix, if that doesn’t work then try Oxalic. Both via pump sprayer
Could be acid burn
