I am going to be staining my patio in very near future. But first I have to etch it, and I need to know if the etching/rinse water solution run-off will damage some plants that surround the patio. Do I need to "dam" the patio and direct the rinse water to the grass in the yard or what? The plants in question are mostly banana trees but there are some tropicals that wouldn't want to kill either..pygmy date palm, philadendron, etc.
All advice/previous experience appreciated.