I use a sanding technique using paper pads, approx 400 grit. It cuts thru the mineral deposits fast and after the paper loads will polish the stone with the same pad. You have to use some skill, go lightly when the pad is fresh.  Before you start use a window razor to remove all the soap scum. 

Sent from my iPhone

On 28 Aug 2015, at 7:48 am, hectorcastillo@comcast.net wrote:

Stone Pro Scub here.
works good.
Hector Castillo

From: "Tony Warney" <tony@excelstoneandtilecare.com>
To: sccpartners@stoneandtilepros.simplelists.com
Sent: Thursday, August 27, 2015 1:49:04 PM
Subject: Re: Hard water spots

Hey Carl
We use Stone Pros Stone Scrub and / or Bio Clean.
White pad and Makita

On Thu, Aug 27, 2015 at 10:15 AM, cpstaples <cpstaples@msn.com> wrote:
anything new on the market for hard water spot removal on marble


Sent on a Sprint Samsung Galaxy S® 5

 
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--
Tony Warney
Excel Stone and Tile Care
760-788-9400
 
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