Chalky white residue from lead windows..

[Damo J]

Ive started cleaning the misses' grandpa's house, did the first clean last month. Frames were green and windows were dirty as hell, after i bladed white marks appeared around the edges of the lead when the water started to dry. I polished the **** out of them, everything looked sweet before i left. So i assumed it must of come from my washer or wet cloth with all the dirty green from frames. I come back this week and notice a few a white marks had reappeared. So i started on the upstairs front bay, and same thing, white marks appearing again. Its taking alot of time to polish these off as i have to do them a diamond at a time. At this point i assume its coming from the lead? I havent come across this before with other lead windows ive done, so just wandering if someone can shed some light.

 

[Tuffers]

Are they the proper old style lead? The white stuff could be calk.

 

[Damo J]

Not sure, the frames are upvc so im guessing not?

 

[mark]

its coming off the frames,its a chalky residue.there a ***** to do

 

[Damo J]

Ill try clean the glass first next time then. See what happens.