Looks like etching to me, since the lettering is probably painted on the panels I would just recommend you hitting it with some color enhancer



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


-------- Original message --------
From: Tony Warney <tony@excelstoneandtilecare.com>
Date: 01/15/2016 9:29 PM (GMT-05:00)
To: sccpartners@stoneandtilepros.simplelists.com
Subject: travertine staining

Looking for some  ideas that are not to aggressive for removing these stains.

--
Tony Warney
Excel Stone and Tile Care
760-788-9400
 
Visit list archives, subscribe, unsubscribe or change your subscription 
preferences:
http://stoneandtilepros.simplelists.com/sccpartners
 
Start a new conversation (thread): 
sccpartners@stoneandtilepros.simplelists.com