Render stains

[DD97]

Hi all

 

Our new render gets these stains following heavy rain. Appreciate it isn't as bad as other render stains you can find but it's driving me nuts.

 

any solutions to clean/prevent?

 

will sealant on the render help?

[ProDave]

Need a close up picture.  That window cill should have a drip bead built in, I wonder if the drip bead is too close to the render.

[DD97]

Thanks Dave, it's on the second floor so I can't really get much closer. It looks better when dry but I think I need a window cleaning brush or similar to remove the dirt - would that work?

[Bonner]

The cill should have a groove to prevent rain drips running back to the wall

[DD97]

Thanks Bonner, are these easy to put in without changing the sills?