[ascjim]

Something has ran from the back of the flashing.

We have tried neat Hypo, but it isn't shifting.

Any ideas?

[nathankaye]

Ive still to get my first house clean, so no experience in this area.
But maybe, as rest is really clean, perhaps carrying some small pots of paint and do a touch up. Customer be non the wiser?
Perhaps

[Kev Martin]

Something has ran from the back of the flashing.

We have tried neat Hypo, but it isn't shifting.

Any ideas?

I would try a heavy duty acidic cleaner personally

[ascjim]

Would the render be ok with acid? I would love to paint it but matching the colour would be a pain

[chris scott]

Tannin or Rust….Get pinky stinky of Kelvin Martian.

[Kev Martin]

Tannin or Rust….Get pinky stinky of Kelvin Martian.
[/quote

Shuddup the Pinky Stinky consignment hasn't arrived you twerp

[Aqua Power Solutions]

Get some Owltrol Netrol This contains already mixed Oxalic acid . If this is a rust stain it should remove it
Do a test patch !
Ed 

[Smurf]

Tannin or Rust….Get pinky stinky of Kelvin Martian.

 now that made me chuckle chris 

[Smurf]

Something has ran from the back of the flashing.

We have tried neat Hypo, but it isn't shifting.

Any ideas?

So I take it that happen after you used hypo to clean the render walls on that house?

[ascjim]

Yeah that's right.

Maybe a steam cleaner will get it off?

[ascjim]

Surely this it like a Doff?

http://www.hss.com/hire/p/steam-cleaner-osprey

[Mike Halliday]

That stain is the colour of bitumen,

Is it lead flashing or Flashband ( an adhesive bitumen tape often used instead of lead)?

If it's Flashband then that might be a bitumen stain which would need a solvent to dissolve it

Or they might have used a bitumen paint to give an added waterproof layer behind the flashing,

[BDCS]

My guess would be leaking lead flash with galvo steel soakers. Oxalic.

[premier window cleaners]

Surely this it like a Doff?

http://www.hss.com/hire/p/steam-cleaner-osprey

Its nothing like a Doff, no where near as good

[ascjim]

I'm hoping it will get it off. 150 degrees like the Doff so fingers crossed

[chris scott]

Cedar Shingles or Rosemarys  ?

[BDCS]

I did some work for the blokes doing some refurb on some gaf near me this week - 15th century !

http://www.canterbury-cathedral.org/2016/03/21/work-on-the-great-south-window-continues/

Not a dof in sight - interesting poultice receipe though

[Kev Martin]

I did some work for the blokes doing some refurb on some gaf near me this week - 15th century !

http://www.canterbury-cathedral.org/2016/03/21/work-on-the-great-south-window-continues/

Not a dof in sight - interesting poultice receipe though

Karl

Why was it  interesting

Kev

[ascjim]

Going to try and steam it off on Monday.

Also had reports of plants starting to die in the area! And sticky window sills after they have been cleaned.

What a cock up!

[BDCS]

I did some work for the blokes doing some refurb on some gaf near me this week - 15th century !

http://www.canterbury-cathedral.org/2016/03/21/work-on-the-great-south-window-continues/

Not a dof in sight - interesting poultice receipe though

Karl

Why was it  interesting

Kevin,

I was at the stone mason workshop  at Canterbury Cathedral and they were made the poultice out of some stone dust and ground paper which they mixed up into a paste and wrapped in cling film. Not a dof in sight. They are auctioning the old bits of the great South window so if you want a piece of 15th century history then get your bids in. I was in a rush but I'll go in and have a chat with the boss when I go into Canterbury and I have time spare.