Removing Algae, greening from walls?

I've painted my garden brick walls white and now some areas are stained green, it's also affected the brickwork at ground level under my exterior kitchen door.
I've tried wiping them down but it doesn't remove it, any advice would be much appreciated!

Re: Removing Algae, greening from walls?

I get lots of algae on my paths and walls Honey, so if it's just a small area I spray with a garden mosskiller, but for larger areas I use a jet washer.

Re: Removing Algae, greening from walls?

Hello Honey, I used Algon - environmentally friendly and very effective on my low wall and the tarmac under my holly bush. I have used a jet washer but sometimes it brings off the paint or mortar.

Re: Removing Algae, greening from walls?

My cedarwood greenhouse went very green over last winter. I bought a container of stuff from Homebase (it may be called Pathclear, but I'm not going out in the rain to check ) It was mixed in a bucket of water and I washed the outside of the greenhouse with it (using a long handled soft brush). I think it had to be left for 30 mins. or so, and then the whole lot hosed down. Within 24 hours the green had gone, and stayed gone. It may take longer in damp weather. I did it in April and was delighted with the result.

Re: Removing Algae, greening from walls?

Hi there, some of the fresh paint has already started to come off where I've rubbed it down.
Do these treatments stop the algae from returning or do you have to keep re applying them plantman, cranberry?

Re: Removing Algae, greening from walls?

Using the treatment that I used the surface being treated does not get any rough treatment to damage it.

You need to be careful where you use jet washers, they can do a lot of damage on the wrong surface.

Re: Removing Algae, greening from walls?

I only use the Algon on a yearly basis, Honey.

Agree about the jet washer - use with care...

Re: Removing Algae, greening from walls?

I might have mislead you Honey, the mosskiller that I was referring to was in fact a patio mosskiller which is available online or at B&Q, and which I apply with a garden sprayer and lasts about a year.

Re: Removing Algae, greening from walls?

I'm assuming the unwanted greenery I've got is algae though I'm not certain, I read about something called greening which is what's happening to my brickwork, do you know if I can upload pics to the forum? It would be easier to show you what I mean as some parts under the door are mottled whilst other areas look slimy green