Have you seen before and after pictures of London buildings being power washed? The caked on coal dust is no joke, just imagine the inside of people's lungs...

Have you seen before and after pictures of London buildings being power washed? The caked on coal dust is no joke, just imagine the inside of people's lungs... https://www.manchestereveningnews.co.uk/news/nostalgia/manchesters-dark-history-archive-pictures-8722223 https://www.manchestereveningnews.co.uk/news/nostalgia/manch...