Try bleach, that usually works
Happy Connecting. Sent from my Sprint Samsung Galaxy S® 5
-------- Original message --------
From: Steve <steve@potomacstonecare.com>
Date: 08/31/2016 9:39 AM (GMT-05:00)
To: sccpartners@stoneandtilepros.simplelists.com
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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