sandstone patio: black mould

My huge sandstone patio has developed what looks like black mould and will not shift with bleach and a stiff brush. My patio runs off into a fish pond. What can I do?

 

Dear Beverly:

It looks like one of those sandstones that develop mildew from deep within. You may try to poultice with Bleach by treating your mildew staining like an imbedded stain, but while the odds would be greatly in your favor, there's guarantee that it will work 100%.

If you're not familiar with poulticing, we have an article available aboput stin removal that will tell you all about it. Such impressive piece of literature will also tell you how to tell stains apart from “stains”, and what to do about the latter! It does carry a small price tag, and you can order it by logging on at:   http://www.mbstone.com/literature/literature.htm.   It's available in pay-per-download format and it's much cheaper than any kit on the market! Not to mention the little and much needed support you'd be giving to the cause – your cause - since every single penny of the cost of the article will be used to support it.

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Ciao and good luck,

Mauri zio Bertoli

 

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