• Stone cleaning, for better or worse? An overview Ingval Maxwell

SESSION I THE BROAD ISSUES:

• A brief history of grime: accumulation and removal of soot deposits on buildings since the 17th century Peter Brimblecombe

• Towards an aesthetic theory of building soiling Chris Andrew

• Stone Cleaning - a professional view James Simpson

• Sources of building soiling and a review of the stone cleaning industry 1991 Trudie Mansfield

SESSION II CASE STUDIES AND EXPERIMENTAL INVESTIGATION:

• To clean or not to clean buildings within Edinburgh Alastair Milligan

• Scott Monument - a brief study report Hurd Rolland Partnership, John Dixon

• The cleaning of the Palace of Westminster Chris Tucker

• A conservator's approach to architectural stonework Jane Porter 

• The composition and weathering of sandstone with relation to cleaning Brian Bluck

• Abrasive cleaning of sandstone buildings and monuments and experimental investigation Maureen Young and Dennis Urquhart

• Research on cleaning methods applied to historical stone monuments Martin Werner and Claudia Neuwald

• Experience with cleaning and consolidating stone facades in Hungary Mihály Zádor

SESSION III THE CLEANING OF CARBONATE STONE:

• Stone cleaning by the inversion of gypsum back into calcium carbonate Theodor Skoulikidis and Paraskevi Papakonstantinou 

• Removal of sulphated-crust from marble using sulphate reducing bacteria K Lal Gauri et. al.

• Geochemical considerations in the cleaning of carbonate stone Richard Livingston

SESSION IV URBAN CONSERVATION ISSUES:

• 'Acid Rain': the cleaning and conservation of stonework in Bath David McLaughlin

• Conservation and planning considerations in stone cleaning Chris Andrew and Emma Crawford

• Stone cleaning in urban conservation Dennis Rodwell

• Building cleaning - process or procedure, an industry view Craig Liddle

SESSION V CHEMICAL AND MICROBIOLOGICAL STUDIES:

• Chemical cleaning of sandstone - comparative laboratory studies John MacDonald et.al.

• Effects of particulate air pollutants on materials: investigation of surface crust formation Brian Whalley et.al.

• The impact of stone cleaning on micro-organisms and microbially influenced corrosion Markus Wilimzig et.al.

• Microbial interactions with building stones, with special reference to various cleaning, conservation and restoration techniques Wolfgang Krumbein et.al 

• Microbiological damage to building stone: analysis and intervention Robert Palmer Jr.

SESSION VI STONE DECAY, WEATHERING AND FUTURE PROSPECTS:

• Assessment of building stone decay: a geomorphological approach Bernard Smith et.al. 

• Decay mechanisms of oolitic limestones in an urban environment: King’s College Chapel, Cambridge and St Luke’s Church, London Nick Schiavon

• The weathering of the statues of Prato della Valle and the criteria used for consolidation Vasco Fassina

• Weathering as a controllable phenomenon Frank Hawes

• Cleaning or proper detailing to prevent cleaning? Leo Verhoef

• The removal of graffiti Roy Butlin et.al.