How to remove dirt from silicone rendered wall?

[windsortg]

I had a new 20m retaining wall built last year in my garden. The face of the wall was coated with a light grey colour of Premium Bio Silicone Render. Due to splashback of rain water from the patio and general dirt, parts of the wall are dirty with dirt stains. I tried scrubbing the dirt off with soapy water and a brush but all I ended up doing was spreading the dirt along the wall.

Can anyone suggest the best method to remove the dirt stains off the wall? I have read that I should avoid high pressure wash as this can damage the silicone render.

 

[kp00110]

Try a jet wash but standing very very far back to start and work in towards it?

 

[windsortg]

Thanks @kp00110

Is there any solution I could look to initially spray on before using a jet wash?

 

[Wayners]

You can hire long lance with round wall washing head. Tracer head I think they are called. Your problem is lower though.
Need the correct soap.
Maybe traffic film remover or something like that will work

This may help

Maintenance

K Rend facades are a low maintenance finish, which will require the minimum of upkeep. We recommend light cleaning and maintenance from time to time.

www.k-rend.co.uk

 

[windsortg]

I have attached a couple of photos showing the dirt on the wall.

Would a 1:1 ratio of household bleach and water, along with a light jet wash be OK to use in trying to clean the dirt off the wall?

 

[Old Salt]

You could try this. I used it to good effect on oil stains on my driveway.

No Nonsense Heavy Duty Degreaser 5Ltr - Screwfix

Order online at Screwfix.com. Ideal for the workshop, garage, factory and warehouse. Effective on a wide range of stains and on a variety of surfaces including metal, glass, plastic, painted or sealed wood. Suitable for use with pressure washers. FREE next day delivery available, free collection...

www.screwfix.com