Overview v Stone cleaning, for better or worse? An overview Ingval Maxwell v Session I The Broad Issues v A brief history of grime: accumulation and removal of soot deposits on buildings since the 17th century Peter Brimblecombe v Towards an aesthetic theory of building soiling Chris Andrew v Stone cleaning - a professional view James Simpson v Sources of building soiling and a review of the stone cleaning industry 1991 Trudie Mansfield v Session II Case Studies and Experimental Investigation v To clean or not to clean buildings within Edinburgh v Alastair Milligan v Scott Monument - a brief study report Hurd Rolland Partnership, John Dixon v The cleaning of the Palace of Westminster Chris Tucker v A conservator's approach to architectural stonework Jane Porter v The composition and weathering of sandstone with relation to cleaning Brian Bluck v Abrasive cleaning of sandstone buildings and monuments and experimental investigation Maureen Young and Dennis Urquhart v Research on cleaning methods applied to historical stone monuments Martin Werner and Claudia Neuwald v Experience with cleaning and consolidating stone facades in Hungary Mihály Zádor v Session III The Cleaning of Carbonate Stone v Stone cleaning by the inversion of gypsum back into calcium carbonate Theodor Skoulikidis and Paraskevi Papakonstantinou v Removal of sulphated-crust from marble using sulphate reducing bacteria K Lal Gauri et. al. v Geochemical considerations in the cleaning of carbonate stone Richard Livingston v Session IV Urban Conservation Issues v 'Acid Rain': the cleaning and conservation of stonework in Bath David McLaughlin v Conservation and planning considerations in stone cleaning Chris Andrew and Emma Crawford v Stone cleaning in urban conservation Dennis Rodwell v Building cleaning - process or procedure, an industry view Craig Liddle v Session V Chemical and Microbiological Studies v Chemical cleaning of sandstone - comparative laboratory studies John MacDonald et. al. v Effects of particulate air pollutants on materials: investigation of surface crust formation Brian Whalley et al v  The impact of stone cleaning on micro-organisms and microbially influenced corrosion Markus Wilimzig et. al.v Microbial interactions with building stones, with special reference to various cleaning, conservation and restoration techniques Wolfgang Krumbein et al v Microbiological damage to building stone: analysis and intervention Robert Palmer Jr. v Session VI Stone Decay, Weathering and Future Prospects v Assessment of building stone decay: a geomorphological approach Bernard Smith et al v Decay mechanisms of oolitic limestones in an urban environment: King’s College Chapel, Cambridge and St Luke’s Church, London Nick Schiavonv The weathering of the statues of Prato della Valle and the criteria used for consolidation Vasco Fassina v Weathering as a controllable phenomenon Frank Hawes v Cleaning or proper detailing to prevent cleaning? Leo Verhoef  v The removal of graffiti Roy Butlin et al