Protecting Plants while softwashing

Why not spray them with water first then hypo mix then water again trying to cover plants like that is very time consuming and there is large areas of the walls that you cannot get the mix on with it all coverd up , we have never killed any plants in 10 years and I have some very fussy customers ????

I always soak the plants as well as not all plants can be covered but I have found that bushes like these take secs to cover and it just another precaution which we like to do