Elementary question - but I am a rookie at the application side of things so I am asking... How do you guys 'see' where you have already applied herbicide (like 3 way) when spraying a lawn? I see Trugreen with their trucks and hoses and it looks like they are just randomly covering the lawn. I want more accuracy than that. Is there an organic 'tint' or something like that so you can see where in the heck you have already covered? Just curious.