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I never bother putting anything down before hand as the pressure washer does the cleaning but I do put down a biocide a few days later that has a residual effect to keep algae and lichen at bay for quite a few months. The benefit is that initial run off only contains water and dirt.
This recipe is reccomended on the Paving Expert website. I know the guy (Roger) who first posted the recipe - he runs a very susccessful pressure washing company.
I have used it on a brown/buff Indian sandstone as well as some block paving with it - it makes the jet washing easier and makes the clean look really thorough.
Rogers Jollop
sodium hypochloride 1 litre
water 4 litres
baby shampoo a dash around 100ml
mix this up using suitable PPE
then apply and allow a 20 minute dwell time
wash off with clean water
be aware that this can bleach and kill plants and organisms
Cheers
John