I used to professionally clean brick and granite buildings using a restoration cleaner. One brand name is Sureclean. The principal active ingredient is hydroflouric acid: not to be confused with hydrocloric acid from which muriatic acid is derived. It also has surfactants which are basically soaps. Application would be followed up with high pressure water but it is not necessary. Bristle brush would be OK. The acid eats up iron stains, carbon, skin, and glass. May require many applications in rapid succession.
Goto Sureclean site for dealers. Read the MSDS on their site. This is powerful stuff and needs to be handled with care. Can damage lungs in confined space.
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Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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