Chlorine Is A Deadly Chemical. Why Do People Say They Are Cleaning Roofs With Chlorine? I Buy Sodium Hypochlorite @ 10.5% And Dilute It Way Down For Roofs. Chlorine & Sodium Hydroxide Make Sodium Hypochlorite. When You Buy Sod/hypo @ 10.5% You Are A Long Way From Chlorine. Does anyone agree? Tim