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Hi all I have been asked to clean this wall, it’s a render with white small marble style stones imbedded. I can’t pressure wash or scrub it too hard as all comes away too easily!
It needs softwashing a hypo mix of 4-1 but don’t put washing up liquid in it as it’s illegal and carcinogenic , wet the wall down with the garden hose then apply hypo mix keep it wet and keep re apply allow 20-30 muinits between coats bear in mind hypo is less effective in temperatures below 10 degrees .
The wall is pebbledash once it starts to kill off the bacteria rinse with the hose keep applying mix until the wall is clean , you could also do the job with a biocides but it will take several months to clean it .
Using Washing Up liquid mixed with Sodium Hypochlorite has serious health problems
Most washing up liquids inc Fairy has Amonia in it.
When you mix Amonia with SH you create a gas which is harmful to lungs - similar to Mustard gas as used in previous wars to kill soldiers in the trenches.
In the USA Fairy Liquid is called DAWN - it has a warning message on the label DO NOT MIX WITH BLEACH - Proctor & Gamble make both products but for some strange reason it does not put the warning on UK labels.
There are chemicals out there designed and manufactured to mix with bleach which are safe to use.
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