Hi All, I’ve been skulking around the perimeter of this listserv well over a year now and recognize I’m past due introducing myself. I’m a project manager in Denver, currently working a corporate ebusiness contract, which could not be a further throw from the wonderful world of stone. Most other times, however, I’m easily found in two of our historic cemeteries. Over the last few years, I’ve done monument conservation training with NCPTT, received my cert from Jahn to use their restoration mortars and generally spend my time teaching other volunteers stone assessment practices and cleaning, and doing small repairs. We’ve had success with several products from Prosoco (Biowash & 2010) on stable but soiled marble, limestone, and unpolished granite monuments. However, I haven’t had any success cleaning polished granite. Most of the soiling is obvious black layering which is likely carbon based deposits from the many industrial stacks and railroad/other vehicle emissions so prevalent in the area. Does anyone have thoughts on how to safely clean these polished granite headstones and monuments? Many thanks, Jayne Uhlir -- To terminate puerile preservation prattling among pals and the uncoffee-ed, or to change your settings, go to: <http://listserv.icors.org/archives/bullamanka-pinheads.html>