Prewashed salad bags can make it easy to get healthy meals on the table quickly. And while in most cases they’re perfectly safe, you may want to consider washing your baby spinach again. Researchers from the University of California River-side recently discovered that small peaks and valleys in baby spinach leaves could be linked to bacterial outbreaks involving leafy green vegetables. The reason: When washed in a commercial facility, the water doesn’t reach into the crevices in the leaves, and therefore bacteria can get caught there and spread. The researchers, who believe this may be why there have been numerous E. coli cases linked to spinach, are working on a better way to clean the greens.