I've seen a few bags of salad greens marked "triple washed". I did a Google search and there seems to be some debate on whether it needs to be rewashed after you buy it.
This article says
If you've ever grown lettuce or been in a field of it, you know that greens grow pretty close to the ground and can have a hefty amount of dirt on them.
So producers wash their greens before they bag them.
"Many precut, bagged, or packaged produce items are prewashed and ready to eat," according to the FDA. "If so, it will be stated on the packaging, and you can use the produce without further washing."
The triple-washed process doesn't just use water; it also uses sanitizers to kill bacteria and other pathogens
I'm uncertain what to make of this in terms of halacha. The washing kills bacteria. I'm assuming that if it kills bacteria, it must be killing the bugs, too, but it's unclear how thoroughly this washing is eliminating dead bugs.
Does anyone know what actually happens, and if one can use these types of products without having to inspect the leaves yourself?