We have a sun room/conservatory. Where full length window abuts single brick thickness wall there is a strip of black mould approx 6 ins wide the full height of the wall. Wall is rendered on outside. It is upvc window frame. There is also a radiator attached to wall close to window. Mould can be readily washed off but recurs. Is there a mould resistant paint we can use or other action we can take without putting up a layer of insulation blocks outside and re render.
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