You have to find the soource of the moisture. It looks like this may be surface water puddling on the surface. I would go back when it is raining and see if water is puddling.
 
You should be able to remove it with a good slightly acidic product
 


 
On Wed, May 20, 2009 at 11:22 AM, Alex Rivera <alex@stonebuff.com> wrote:
What is Prosoco?  Do they have a web site?


On Wed, May 20, 2009 at 10:10 AM, <don@srsdenver.com> wrote:
Moisture test would be appropriate. Prosoco has some excellent products for this

Sent via BlackBerry by AT&T

From: PBunis@aol.com
Date: Wed, 20 May 2009 08:56:51 EDT
To: Restoration and Maintenance<sccpartners@stoneandtilepros.com>
Subject: [sccpartners] saltillo w/ efflourescence
I have a customer with Saltillo tile efflourescence tile on exterior wall only of this room. See attached photos.

Powered by http://DiscussThis.com
Visit list archives, subscribe, unsubscribe or change your subscription preferences
Start a new conversation (thread)

Powered by http://DiscussThis.com
Visit list archives, subscribe, unsubscribe or change your subscription preferences
Start a new conversation (thread)


Powered by http://DiscussThis.com
Visit list archives, subscribe, unsubscribe or change your subscription preferences
Start a new conversation (thread)




--
Frederick M. Hueston PhD
www.stoneforensics.com
www.stoneandtilepros.com
My New Radio Show  www.thestoneandtileshow.com
Become a Stone and Tile Inspector..sign up for our next class in October 2009 (only one class per year is offered) www.thestoneandtileschool.com