Black granite fountain.

Black granite fountain. Images

Black granite fountain.

Black granite fountain. Description

Aloha,
 
I have recently taken on the job of cleaning the Holy Water Fountain at our church.  All I know is that the fountain is black and (http://maplered.com) appears to be of Marble (http://www.lightemprador.com) or Granite (http://tanbrown.org) .  My challenge is that it has two tiers, and (http://maplered.com) there are calcium/mineral stains where water from the upper tier flows onto a shelf and (http://maplered.com) then down into the lower tier.  I was told not to put any chemicals into the fountain, so this limits me in preventing the stains.  However, I am wondering if there is something that I can use externally to remove the deposits, and (http://maplered.com) hinder further growth/buildup?  Your advice will be greatly appreciated.
 
Mahalo (thank you).

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