That's what we were told by our hort professor at U.of Delaware, the difference between soap & detergent. Seemed to be right since some I've used burned plants while others didn't. Never had a burn from Joy & a lot of insects are repelled by the scent of lemon. Guess it doesn't matter what it is as long as it works safely. Also, a lot of insects have a waxy coating which makes them somewhat water repellent & helps them adhere to plants. By breaking that down, they loose that adhesion & can be rinsed away. The most obviously waxy insect would be the mealy bug.
--- Parry, you've topped your plant. Many growers do that on purpose. It makes them branched & bushy, so it's not a bad thing. As your plants grow, you'll see the difference it makes. Grown natural, you'll have one big main cola with smaller side buds. The one topped will have more, but smaller buds. Its a personal preference. After you harvest, you will know which you like best. There are many methods of pruning & manipulation. You'll find mention & description of them scattered all over the board. Some are more advanced, so its best to stick with natural & topping untill you get the hang of growing.
~~~~ PEACE! ~~~~