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Brown/orange spot stains on patio

2 years ago

Does anyone know what could be causing these stains on outdoor tiles?


thought it might be birds but now wondering if it could be pollen from a tree or plant


clean it off then seems to be back next day with lots of spots randomly 2-3 every 4th or 5th tile. so over 40msq area there ends up being about 40-50spots come back