Sandstone Problems

[JeffC]

We're doing this job at a multi-million dollar estate where everything is either Limestone, Flagstone or Sandstone.
The Limestone and Flagstone have presented no problems so far but the Sandstone has been a major pita. It doesn't look like it's been cleaned properly in years and in places is covered with these whitish looking deposits that react like a sealant when water is applied to it. (I believe it's lime)
Anyways the home owner will not allow us to use anything that's going to harm his landscaping and we have used everything in our storage unit trying to get this sandstone clean.
I'd love to share some pictures with you guys but cameras are not allowed inside the gates of this estate.
Do any of you out there have any ideas how we can get this sandstone cleaned without harming the surronding landscape?

 

[john orr]

Might it be possible to have the owners take a photo? You don't need a pic of the building, just a close-up of the offending stains.

 

[grasshawg]

www.klenztone.com. I've tried it on old unpolished granite headstones. Works like a charm. They also have special formulations for sandstone and limestone. Check 'em out.
Randy

 

[squirtgun]

Jeff,
Where in Georgia?I may be able to help or know of a contractor close by that can give assistance.

 

[JeffC]

No, we can't even have camera phones on our person while we're on property.

 

[JeffC]

Thanks for the advice, but come to find out it was fake sandstone and now the owner of this estate is sueing the contractor who sold him sandstone walls.