Stain on newly rendered wall

rustykettle

New Member
I had a new front wall built last summer which was breeze-block rendered with a Johnstone's Acrylic coloured render. Soon after the render was completed a stain appeared which has been there ever since. I have tried a product called Wet'n'Forget to try and remove it, but it has not worked despite the manufacturer's assurance that it would work in time. I don't what the cause of the stain is, could it be water getting where the tiles meet the render / brickwork? I would like to know if there is any product that might get rid of it permanently, as I fear if I just paint over it it will reappear. Grateful for any suggestions or ideas.
 

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