Tricks of the Trade - Why do you pretreat when washing

I wanted to show a couple of reasons why we pretreat. 1) You can remove all the debris out of the way, so you're not getting your surface cleaner bar all wrapped up in this pine straw or whatever you have in your area. 2) You're going to also the water and soap to soak and help loosen the dirt and grime 3) You get to find out which way the water is running. So I start at the bottom, while I go back and forth, all the dirty water flows down and doesn't sit in what I just cleaned. That way I only have to clean once.