removing red algae marks from external render

daisyboyd24

I’m looking for the best way to clean the render on the outside of my house.

My house is 13 years old and the last year or so I have noticed more and more red marks appearing.

A few houses in the area had their exterior painted last year but I’ve noticed the marks are coming back through already.
I’ve been told this is algae and needs to be removed before painting.

Does anyone have any experience with removing these marks?
I’ve done quite a bit of research and it sounds as though bleach and a stiff brush will help or moss killer but looking for some 1st hand experience before I go up the ladder!

Thanks!

NeverInDebt

I use patio magic or algon to remove algae does no harm as its organic

http://algonorganics.co.uk/
http://www.wilko.com/weed-killers+weed-guards/patio-magic-25l/invt/0263130

daisyboyd24

Thank you NeverinDebt. I will give Patio Magic a go as I can get it in my local Homebase!

Hopefully I will have a good result from using it.

Appreciate your reply :-)

NeverInDebt

Takes a few days to act I use a 5 litre spray gun. I use it on my flat roofs to remove algae, driveway and on allotment greenhouse and water tank. saves all hard work using a pressue washer or harsh bleach