I have put 2 photos up on www.PhotoBox.co.uk
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password: stain
One photo is a close up shot of a stain and one is of an area of the wall.
Thank you for your help.
The stains are the shape and size of a tennins ball, on the internal surface of one wall in a downstairs room. They appear in a regular pattern every 6 inches horizontally and vertically all over the wall. Beyond this wall is a cavity and then an external wall. The house was built in the 60s...