I water down several times , before during and after, as much as I can . I always have a hose or a spare back pack close buy all the time .
before I start I have a thorough look around at everything.
I will add I have only been softwashing for 2 years , so I am still learning. perhaps thats why I am so careful?
I use hypo on gutters and fascias now nearly always , although for these jobs I only use a weal 1 part in 10 mix