[Darranvps]

Please click here to see
http://www.cleanitup.co.uk/smf/index.php?topic=121989.0

Thanks

[the bfg]

the only thing I can think of which may help is a hot pressure washer

[Darranvps]

That was our thoughts also, perhaps we will give it a go

Cheers

[Pope vader]

will need repainting  as stains will be in the paint

[Small but perfectley formed]

www.tensid.co.uk they supply specialist chemicals for pressure washing

[Ace Windows]

I use a product called Granocryl. It is made by Leyland.

http://www.google.co.uk/products/catalog?hl=en&q=granocryl+fungicidal+wash&um=1&ie=UTF-8&cid=10561820174232427171&sa=X&ei=P6WoTZnwKoGb8QOsupWnBg&ved=0CC4Q8wIwAg#

I apply it via a backpack and WFP brush. If you agitate it onto the surface and leave it for 30 minutes or so before washing it of with pure water it gets rid of all the green and kills the roots of the algae growth. It is good stuff. (I have only had to reapply it once on a really filthy job)

A 1ltr bottle mixes to 5ltrs of solution. I pay £3.19 per bottle.

If you want to try it but cannot find any I would be happy to post a bottle or two to you. would just need to find out the postage cost.   

[richard jagger]

I would spray it with cheep household bleach from a backpack leave to work and brush and rinse off.

[Darranvps]

Thanks for all of your help guys, most appreciated.
I will give it ago with some of the products mentioned.
Cheers

[Ads]

Hi,

I have cleaned many metres of this coloured render in a lot worse condition. Make sure that the render is in a sound condition without any cracks. We have found that 90% of the time cold water is good enough. Do you have a flat surface cleaner? This seems to work very well on this type of surface because of the better spray coverage which gets into the small pores.

If this fails, heat will certainly help.

I try to avoid harsh chemicals where possible as this can cause further problems.

If you give me your email I will give you some pictures of us in action.

[prestige cleaners]

Is it the same stuff you find on new builds?
Ive done one job with that stuff, and it came off fine with a pressure washer
. Got covered in sand though.

[Darranvps]

Hi,

I have cleaned many metres of this coloured render in a lot worse condition. Make sure that the render is in a sound condition without any cracks. We have found that 90% of the time cold water is good enough. Do you have a flat surface cleaner? This seems to work very well on this type of surface because of the better spray coverage which gets into the small pores.

If this fails, heat will certainly help.

I try to avoid harsh chemicals where possible as this can cause further problems.

If you give me your email I will give you some pictures of us in action.

Hi Thanks - rhino.clean@yahoo.co.uk

[Seers]

Hi Rhino,

The surface is K-Rend which is basically self colouring render, used extensively on new builds over the last 5-10 years.

If you blow a hole in it with a pressure washer, easily done, any repair patch will stick out like a sore thumb.

We have cleaned the cream/white coloured K-rend successfully with bleach on many new builds.

The stuff is supposed to be maintenance free but many house builders are now resorting to painting K-rend on large apartment blocks etc a couple of years after installation as they are very difficult to clean successfully, which basically defeats the whole point of using K-rend in the first place.

Cheers,

Huw

[Seers]

Hi,

Link from K-rend website about cleaning algae:

http://www.k-rend.co.uk/media/9c986a4cfcd842d0bedd2a07a7c9cbf4ALGAE%20CLEAN%20flyer.pdf

Cheers,

Huw

[Darranvps]

Thanks Huw

I have managed to get some Hypochlorite which Alex and Alan recommended, so I will give that a go tomorrow.

Cheers

[alanwilson]

FYI - Sodium Hypochlorite is bleach, usual safety precautions apply

[Jimmy Jon]

Rhinoman - How did you get on with this job in the end? I have been asked to clean a large building which has the k-rend surface which is dirty and covered in algae. Any advice would be much appreciated. Thanks