Most rooftops are pitched, which will result in the cleaning fluid flowing through the gutters, and then falling down the downspouts. If you don't have the ability to shoot like a sniper using the trigger gun of your chemical, some of the solutions will flow through the roof's edges into beneath the floor.
It's all manageable by you, but only if are aware of the process. Let's first discuss instances where there is a chemical that is falling or spilling over the edge of your roof as you apply Roof Cleaner.
If you're doing it on your own then this might be a concern If you're working with helpers (as you ought to be) the issue is virtually no-problem. Be sure that the person you're helping is proficient in the art of diluting and rinsing.
As for the huge runoff of roof cleaners in the downspouts and gutters, it is important to instruct your rinsing assistant to be extra vigilant about the areas where they spill out onto the grass and bushes. These areas are especially vulnerable to damage from bleach in the event that they aren't properly cleaned and diminished.
It's not difficult to manage the chemical spray that is used to clean your roof or runoff. Make sure to use your brain and plan ahead before spraying the roof, and everything will be in order.