I usually buy bagged salad. For me it's just easier. Often a bit more expensive but oh well.
I have never once re-washed a bag of lettuce that says it was washed (yes how gullible of me obviously) I've never been sick from doing this either. I also don't re-wash the bagged snap peas, broccoli, cauliflower.
I do wash 'loose' food. Loose salad leaves or heads of lettuce. Tomatoes, apples, any berry, asparagus, and many others etc. But I use a water/vinegar mix, not bleach.