Even when they're labeled "ready to eat," pre-washed salad greens can contain harmful chemicals—and probably aren't even totally clean. ... With many pre-washed greens proudly proclaiming that they're “ready to eat” or “triple-rinsed,” we can trust that they're clean and safe…

Are pre-washed salads safe to eat?

Pre-washed doesn't mean safe to eat, he said. It can just mean "looks clean but actually is contaminated with salmonella or E coli". Buy a bag of pre-washed salad and you need to wash it all over again.

Should I wash my pre-washed salad?

Do I have to wash pre-washed lettuce? The quick answer is: yes, you probably should wash pre-washed lettuce. No matter what the bag claims, pre-washed lettuce might not be as clean as you think. The Food and Drug Administration (FDA) encourages lettuce to be washed with a bleach solution to kill harmful bacteria.