What's this

[J and S]

Called back to a house from earlier in week saying one of the bedroom windows is still dirty.

Thinking I must have some how missed it went back and sure enough still "dirty".

Poled it and made no difference so ladder off and trad it and still no effect...what is it.

She's calling the window company back as they were only fitted last Sept.

 

[Leeds]

Weird, like smooth water stains.

 

[Phildeeney]

I had something like this last week it was coming from an overflow pipe. It did scrape off though.

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[Adam curtis]

I've got one house like that pritty much all the windows have done that it's all between the double glazing on the outer pane the window company change all the glass in the end lol

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[Dave B]

Got any rubout or some sort of acid to try on it??

Even vinegar would get it off if hard water deposits from overflow etc

Not your problem but nice to know what it is

 

[Iron Giant]

Staining off coloured render, I use bronze wool mini pads not tried it on hard water stains as in a soft water area.

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[J and S]

"Staining off coloured render" no coloured render and just the one window?

Not hard water area TDS 95.

Think Adam Curtis as got it.