Hi all ,
I have a problem keeping clean external rendering ( Monocouche ) not lime stone wash !!.
I have dwarf walls around two sides of my property and a number of raised beds plus paving slabs all of which suffer from the green mold, suggestions involving white vinegar and toothbrushes or other common household products ie old wife’s tales have all been tried:roll_eyes:
no they do not work . As I am old I would prefer recommendations that I can just spray on .
Don’t the brico places have spray-on anti-mousse ready to use in big containers or smaller ones that you dilute? Surely the stuff you use on a roof would do? You need one of those plastic rigid backpacks with a nozzle.
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I suggest using a pressure washer first, and then applying anti-mouse as @vero has suggested. You would need to protect the soil and plants with plastic sheeting first though.
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That only works on rodents though. 
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Be very careful with a pressure washer and renders like monocouche, webber etc, you can blast them off or cut into them.
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Hi vero, yes I think you might be right, several friends have had (very expensive) treatment done on their roofs that gradualy but eventually worked so I might go and have a look at that, trouble is when ever I get the urge to do something it always involves myself having to drive 25km to my nearest town to get material.
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Yes been down that route and you are quite right it is easy to cause damage.
Pressure washer is a no no lots of damage, my plants are mostly Bamboo and Palms which are pretty hardy against most things…even @ChrisMann rodents which I do not see anymore as I feed the neighbourhood stray cats and it is not unusual to see them in the palm trees. The cats that is 
Check your rodentodendrons. 
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Its not the plants I need to check[quote=“ChrisMann, post:9, topic:52276, full:true”]
Check your rodentodendrons.
[/quote]
It is not the plants I need to check spelling might be worth a glance! , original post edited
That rather depends on how close you position the spray head to the object being cleaned, together with the angle of attack of the spray. You mentioned paving slabs and I would not have thought that there is much likelihood of damage to those. There are also different spray pattern heads available for cleaning different surfaces, and some of the admittedly more expensive washers have variable pressure settings.
I have a similar problem myself in relation to mold and moss on a block paved patio area that is against a north facing wall and hence has no sun exposure. The pressure washer used judiciously, and at a low angle to the paviours, gives a good clean without adversely affecting the joints too much. After that it’s just a matter of waiting for it all to dry and then brushing a bit of dry fine sand into the joints where needed.
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