Need advice on, bid 5 story hotel

Hilton garden inn

Has some stain issues, which I was asked to address in bid.

So I am asking for some input . Stain comes from air conditioning units in rooms. Lift for this area doesn't look possible to me . I will be using WFP for the job . The stain is only in area shown.

So was wondering if I could dip one WFP brush in a soft wash mix. Give it some dwell time . Then follow with rinse from jets. It is stucco btw

Thanks John

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