His mix is around the 5-7 minute mark in the video. He also discusses the importance of sodium hypochlorite earlier. Most of the video is him demonstrating the mix using a pump sprayer.Damn, that's a 27+ minute video. Do you have a cliffs notes version of the recipe?
1 gallon water
2 tablespoons dish soap
2 cups bleach*
*the bleach should be 10% sodium hypochlorite. This is more powerful then the concentrated bleach you’ll find in the cleaning section. Use of regular concentrated bleach will require more then 2 cups.
The percentage of sodium hypochlorite will be listed on the bottle.
This mix can be used in a pressure washer. However it’s suggested to be used only with a downstream injector to avoid running bleach through the pump. This will damage the pump. You can mix the bleach and dish soap and run that to the injector, then adjust the injector mix to achieve the desired cleaning power.
I’ve also used it with a pump sprayer and just rinsed with a hose. The mix will clean on its own, it doesn’t need the heavy spray from a pressure washer. But a rinse is needed after the surface is clean.