Damp patches on window reveals

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Hi, looking for any suggestions on a damp problem that has continued for a number of years now on my 1980s house

The majority of my windows and door frames have smallish stains around them , they don’t feel damp.

Over the last few years I have already tried

Cavity wall insulation checked under it’s guarantee, no issues found
Double glazing replaced
All walls covered with a protective paint finish that stops water penetration
Any obvious gaps in sealant or mortar filled

None of this has resolved the issue

After the the last 2 points were completed at the same time I used a stain blocker and just repainted 2 of the window reveals . Slowly the stains have started to reappear.

We have now run out of ideas !



The 1st 2 pictures where repainted , I have drawn round the stain in pencil as it’s quite faint , front bedroom
3rd photo at the back of the house
4th picture downstairs room

I would be very grateful for any other ideas

Thanks
 

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Ok thanks
Repainted window
Downstairs
Back bedroom
 

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