About 7 - 8 min is sweet spot. Just for kicks mix up a small batch, say 10 gal. 3 SH and 7 water and add more soap. If you’ve got some roof snot use it 1 oz per gal, if not bump up the elemonator a good bit. You’ll save some money using less bleach and a little more soap. 4% direct applied is screaming hot. Sure you don’t care on this project, but learn to use the least amount of chemicals necessary to do the job effectively. Just my humble opinion to being a good steward of the environment.
doing it like you’re doing with one applying and one rinsing most efficient. Let him come along 10-15 min behind you.
