[Smurf]

Quick way is to softwash the lot. Take the money and ride off into the sunset...Yehaa! lol
https://www.youtube.com/watch?v=2POARsDm7YA

Works just as well on brickwork too
https://www.youtube.com/watch?v=l-zWo5I4hwk

Mind it's best to keep any overspray and drift of the chem to a min. Then wfp or trad glass after the final rinse down...  Job done

Custards will love how clean their property looks but they may not be so keen on the smell of bleach nor the price lol