I was at the craft fair at The Weatherley Centre in Biggleswade yesterday, and had a number of queries about the care and maintenance of stained glass and leaded windows. During the winter months (November to March) I'll have time to give free advice to any householder or business in the Biggleswade area regarding the condition of their panels, and how best to clean and maintain them.
Key points that people seem to be unclear about seem to be:
Basic cleaning and polishing
Impact of ageing on lead, how to spot it, and how to slow it