Had a call tonight to look at a job on monday, she said that 80% of the windows are old style leaded. Asked how i clean and said WFP....she is worried that the water will go through. I have cleaned trad and wfp leaded windows and been ok but..... I get the impression they are not in the best condition, will see on monday. Do any of you do any that are really old and the lead is getting a bit suspect? Will they leak? If they are that bad then doing trad way would be just as bad from the point of putting pressure on them?