if red touches yellow it will kill a fellow, thats how i was taught to identify a coral snake. red doesn't touch yellow on the similar looking king snake.
back to the bleach thing, i've been doing this for over ten years and everyone has their own opinion. everybody has their own method, but i do a two step wash on houses. i have used the stronger chlorine, but i still prefer store bought lemon scented beach, with a little lemon scented detergent in it. and then i follow with a sodium hydroxide based detergent to remove the chalkiness, dirt, gutter stains, and red mud stains which is a problem here in georgia. then i pressure wash the house inch by inch. my customers pay for a pressure wash, not a chemical bath and rinse. the detergent also cleans windows nicely. i've never killed grass or shrubbery with the store bought stuff. i've even diluted the bleach before running downstream and it still worked good. i do use a 20% injector.
it works for me and i have a happy customer base that is growing, so i doubt i'll ever change chemicals or method. I am getting too old for this stuff, and the change i may soon make is to sell out. good help is hard to find and i'm one of those that really prefers to do it myself, that way i know its right.
jeff