Sure some may crawl back up depending on the force of the water, and their location. But in general they are soft bodied, so they do get injured quite easily.
I try to squash as much as I can without too much pressure on the plant and spray/wash. Most definitely keep your hands/ tools clean as much as possible. Keep an eye out for the direction you are spraying since you could move them to a close by plant.
San Diego / Z10