Peroxide did nothing, It's chiseled sand stone and these spots are on random tiles here and there with no connectoin to plants etc. any thoughts?
Thanks
stephen

-------- Forwarded Message --------

Subject:	What?
Date:	Mon, 30 Mar 2015 10:57:07 -1000
From:	Stephen <mauiwebbs@gmail.com>
To:	stephen@newlifemarblerestoration.com

This email is free from viruses and malware because avast! Antivirus protection is active.