I clean this leaded house, have done for yonks wfp nearly a yonk. Anyway when doing it the other day, the old lass says can I not wfp the 2 kitchen windows as it causes a mist on the inside of the glazing round the lead, but the rest are ok. I looked at them and true enough it formed a mist parraleling the lead on the in between. She says a few people have told her that if you put a large volume of water on leaded windows it can cause it. Never come across it before, but, perhaps crucially she told me that the bloke who did her windows didn't know what he was doing, so I assume when he did those two he missed a trick which allows the misting. Just to clarify, the mist is between glazings, but the seals haven't breached. Anyone else had this?