Staining on pavers

Hey all, customer has these spots spread throughout his back paver stones. My initial thought is Fertilizer stains but there’s not a lot of them and not a lot of the shadowing/streaking that I normally see when looking at fertilizer stains. Any thoughts what they may be? My current plan is to wash entire surface with SH and surface cleaner then apply Oxalic acid over the entire surface at 1 cup/ gallon. Thoughts? Any are appreciated!!

If you there for the stains I would walk. If they want the pavers done and they have rust stains I would tell them you don’t do rust removal. Unless your hurting for work. If you really want to try and clean it surface clean first. Then try oxalic. The spots are so small you could try naval jelly with a tooth brush.

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