Should you wash pre-washed salad greens? - Health

Aug 18, 2026

Romaine calm and put down the salad spinner.

The recent Cyclospora outbreak in the US has put salad in the headlines for all the wrong reasons, and while it’s happening all the way over on the other side of the world, it still might make you wonder how safe your ‘pre-washed’ bagged leafy greens really are.

In Australia, we’ve had our own fair share of leafy green scares – from the massive 2016 Salmonella outbreak linked to Victorian pre-packaged lettuce to the bizarre 2022 recall of baby spinach contaminated with a toxic nightshade weed. When you read about these sorts of things, your first instinct is probably to dump those pre-washed greens straight into a colander for an extra rinse under the kitchen tap. Better safe than sorry, right?

baby spinach leafy greens — Ready to eat means ready to eat.

Should I wash pre-washed salad greens?

Surprisingly, no, you shouldn’t. When you buy a bag of greens labelled ‘washed and ready to eat’, it hasn’t just been lightly rinsed. Commercial producers put these leaves through a rigorous, industrial-scale cleaning process. This typically involves removing field debris, followed by multiple baths in sanitised water designed to kill surface bacteria.

According to the Food Safety Information Council, rinsing pre-washed greens again in your home kitchen sink actually increases the risk of foodborne illness. This is because you’re exposing them to potential cross-contamination – from your sink, from your kitchen counter, from your hands, from whatever else the leaves might come into contact with. And because salad is eaten raw, there’s no cooking process to kill off any newly introduced bugs.

But there is a big ‘but’ here. Parasites like Cyclospora are highly resistant to the chlorine and other sanitisers commonly used to clean pre-packaged greens. While these parasites don’t multiply on food the way bacteria do, they are incredibly hardy and easily survive the journey from the farm to your plate. And they certainly won’t bat an eye at a bath under your kitchen tap. So if there were some kind of parasitic outbreak, your best bet would be to buy whole lettuce, and wash it at home.

washing lettuce — Whole lettuce heads require a thorough wash.

How to safely wash lettuce at home

While pre-washed bagged greens should be left alone, you should definitely wash whole lettuce thoroughly. This is because they haven’t been through any kind of industrial cleaning process before hitting the shops. Here’s the safest way to do it.

Before you even begin, wash your hands with warm, soapy water for at least 20 seconds. Make sure your sink, colander and anything else you’re using is clean. If you’ve recently prepared raw meat anywhere on the counter or sink, give that a good scrub clean with hot soapy water, too.
Next, peel off the outermost leaves and discard or compost. These have had the most exposure to farm dirt and handling along the supply chain.
Now, chop off the root end of the lettuce and separate each of the leaves. This will help you remove any trapped dirt or insects.
Fill a large, clean bowl (or a clean sink) with cold water. Submerge the separated leaves and gently swish them around with your hands. Let them sit for a minute or two – this allows dirt to detach and sink to the bottom of the bowl.
Instead of pouring the water out with the leaves through a colander (which will only wash dirt over the leaves again), lift the leaves out and give each one a quick rinse under a cold running tap.
Now run the leaves through a salad spinner until dry, or pat dry with paper towel.
It’s also important that you only wash your lettuce when you’re planning to use it. Leaving damp leaves to sit around in the fridge only encourages the growth of bacteria.

Simple steps to keep pre-washed salad greens safe

To ensure your bagged greens are as safe as possible, buy ones with a ‘use-by’ date as far in the future as possible, get them into the fridge as soon as you get home, and eat them quickly. And before you unthinkingly reach into that bag to grab a handful of baby spinach, wash your hands.