How to clean pebble dashed house?

A biocide like they use on a roof might work, but you'd ahve to confirm that it wouldnt take the paint off and tbh, you would probably end up wanting to paint afterwards anyway…

ah correct, I totally missed that bit!

Use diluted hypochlorite in a backpack sprayer. Wear goggles, rubber gloves and protective clothing. Follow instructions on container. Test on a small area to determine the required concentration.

You can purchase this in an agricultural co-op. It is used by farmers to clean cattle sheds etc.

You could also use commercial bleach e.g Domestos. I suggest initial testing dilution of 2 bleach to 1 water.

As above , protect yourself well.

Check the active ingredients of your laundry detergent….bet it contains hypochlorite in some form or other

Cnocbui, can you link to the exact product. . And any instructions or dilutions etc. I need to do this myself

From what I’ve seen of pebble dash if you grit blast it you’d end up with a dash wall.

I can't link to the product as Lidl's website doesn't list it. It works on pavers but so far I'd rate the cleanup at 50-60% compared to power washing with a 90% reduction in effort vs power washing just sprinkling the granules. I put the powder in a large wire sieve and shake that over the pavers, mashing larger granules through the mesh.

Best results do seem to come from dissolving in warm water, and using a garden sprayer. I did a section of concrete apron that went dark green after an earlier power wash by spraying and it cleaned up as if I had power washed again. I wouldn't have a dilution ratio, but I'd guess I try for 3-4 cups per 4-5 litres.

The main effect I'm aiming for with the pavers is trying to kill weeds and moss which were my biggest problem. I was hoping for a herbicide type of effect and didn't spray because I wanted granules to lodge in the cracks and stay there as long as possible, slowly being dissolved by the weather. For this it seems to be working a treat, there has been hardly anything growing back after 4 months.

Here's a photo of a section of the pavers I just sprinkled about 10 days ago. As you can see the greatest effect so far is neat the joints, as you might expect with wind shifting the powder a bit and then rain washing and draining. It does take some time to work so the black bits might still improve some.

Here's some I did 4 months ago. Not show home stuff, but I'm chuffed compared to what it was like.