Does anyone out there have any suggestions or experience with the cleaning or removal of bird droppings from Atmospheric Corrosion Resistant Steel (Corten) sculptures. We have a number of large pieces here on campus which are constructed of this material and seem to be the preferred depository of said bird droppings. Any suggestions or ideas would be greatly appreciated. Thank you, Tom. -- Tom Hunter, Collections Assistant Museums and Collections Services University of Alberta Edmonton, Alberta, Canada [log in to unmask]