I've read posts where bleach run off from a storm as caused issues with plants and grass. Why don't we neutralize the roof after washing with BW to prevent any run off issues after we leave the job site?
Sometimes that happens when not enough plantwash was used.Really soak the plants with plantwash. I don't rinse roof because I want the cleaner to soak in well. The only areas I sometimes have challenges is at the downspout, and that is fairly minor. The key is to manage expectations. Tell the customer there might be some yellowing because of the volume of cleaner, even though it is dilluted. The grass will comeback. spray a lot of plantwash at downspout, and put down some dehydrated cow manure and granulated gypsum in the potential area and rake into soil if it is a well maintained yard or a picky homeowner. We started augmenting with CH and that helps.
Looks like you got it Vic. Most of the damage from run off occurs to plants where the home has no gutters, the mix runs right off the roof onto the plants below. While you are there you of course are watering the vegetation and there should be no issues, but you have no control over a rain that come through afterwards or the morning dew that drips off the edge. In Michigan I don't really see to many houses without gutters, so my main concern is the discharge from the downspouts.....that is why #4 in your list above is important. The customer needs to help keep their plants alive as well.
I concentrate on the downspouts and flood the area while the spout is actively draining, as well as put a lot of plant wash down when I am done.
I guess in that case we need to make sure everything is a safe distance from the roof. Of course that should be done with gutters, too, come to think of it.
Great point on on the ground man watering vegetation (and keeping glass wet) at the same time the roof is being cleaned, also.
It may sound like I'm over thinking this, but 'tis better to be safe than sorry, right?
Try using the nerf football technique and gutter cane , but I try to use strictly ch and that drops your risk of killing plant life to an extreme minimum. (my 2 cents) For what it's worth... Wait for AC's 2 cents cuz there worth a million!