Try bleach, that usually works

Happy Connecting. Sent from my Sprint Samsung Galaxy S® 5

-------- Original message --------
From: Steve <>
Date: 08/31/2016 9:39 AM (GMT-05:00)
Subject: Sandstone with green staining from trees

Hello. -- anyone know what I might be able to use to try and get rid of these stains from the trees. I tried grinding and muriatic  acid but neither worked. Any help would be much appreciated. Thanks, Steve

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