How do I remove these lead flashing stains?

[Steve Zodiac]

Your advice appreciated on how to remove these stains on old lead flashing please:

Already tried white vinegar which does a great job on the white oxidation streaks, but it doesn’t touch these dark brown ones.
Thanx

 

[Wayners]

Lead flashing cleaner.
You can get oil for lead flashing to make it look better after

 

[^woody^]

What that rust? Use a specific rust remover, try the purple spray commonly sold for car wheel brake dust.

 

[noseall]

Your advice appreciated on how to remove these stains on old lead flashing please:

Already tried white vinegar which does a great job on the white oxidation streaks, but it doesn’t touch these dark brown ones.
Thanx

Has someone been grinding metal near to the lead?

 

[Steve Zodiac]

Woody : My understanding is that rust is an oxide of iron/steel. This is lead, so although it looks like rust, it can’t actually be rust.

 

[Wayners]

Look's like wood stain to me.
Not covered when staining windows

 

[Steve Zodiac]

Has someone been grinding metal near to the lead?

Good call Noseall, but there are patches along virtually the whole 8m length. So unlikely I’d say

 

[noseall]

Good call Noseall, but there are patches along virtually the whole 8m length. So unlikely I’d say

Probably some contamination in the rolling/milling process. Looks like it's pitted in.

 

[freddiemercurystwin]

When lead is stored in damp conditions prior to installation it can cause degradation of the surface. Not sure this is what's happening here but it might be.