It’s one of those pieces of advice most of us don’t even question anymore.
You bring home fresh produce, run it under the tap, maybe give it a bit of a rub or a light scrub, and feel like you’ve done what’s needed before it reaches the plate. It’s practical, it’s easy, and it’s been repeated often enough that it feels like a complete solution.
And in many cases, it is a sensible step. Washing removes visible dirt, helps reduce bacteria from handling and transport, and can lower some of what sits on the surface of fruits and vegetables. That’s why the advice is so widely shared — because at a basic level, it works.
But every now and then, it’s worth slowing that assumption down and looking at it a little more closely. When we’re told that washing helps remove pesticides, it sounds straightforward. The question is whether that idea applies in the same way to all pesticides, or whether we’ve quietly grouped very different things together under the same simple solution.
This is something we’ve started to explore more closely in our testing work, where results don’t always align with what people expect from everyday foods. Glyphosate in New Zealand Bread test results April 2026.
Does Washing Produce Really Remove Pesticides?
There’s a kind of quiet reassurance built into the idea that whatever might be on our food can be dealt with at the sink. It gives us something practical to do, something within our control, and that alone can make it feel like the problem has been handled.
That reassurance isn’t misplaced. In everyday situations, washing does reduce what’s on the surface of produce. It’s part of why the advice is so consistent across food safety guidance — it’s simple, accessible, and generally beneficial.
But it also has a way of becoming a catch-all explanation. Over time, “washing removes pesticides” can start to sound like a complete answer, rather than a partial one. The detail that often gets lost is that this only really holds true for substances that remain on the outside of the food.
Once that distinction is blurred, it’s easy to assume that all residues behave in the same way, and that the same solution applies across the board. That’s where the conversation starts to drift away from how these pesticides actually work.
Not All Pesticides Stay on the Surface of Food
This is where the conversation shifts slightly, and where the familiar advice begins to feel a little less complete. Not all pesticides behave in the same way once they’re applied to crops, even though they’re often talked about as if they do.
Some substances remain largely on the surface of the plant. They sit on the outer layer, exposed to the environment, which means they can also be reduced, at least to some extent, through washing, peeling, or handling. This is generally what people have in mind when they think about rinsing produce under the tap.
But others are designed to do something quite different. Systemic pesticides, such as glyphosate-based weedkillers, are absorbed by the plant and move through its internal structure as it grows. Instead of remaining on the outside, they become part of the plant’s tissues, carried through its leaves, stems, and sometimes into the parts we eventually eat.
Once you understand that distinction, the question begins to change. It’s no longer just about how well we wash our food, but about whether washing was ever intended to address this type of exposure in the first place.
It’s a question that becomes more relevant when we look at everyday foods — even those designed for children — where trace levels of glyphosate have been detected despite appearing to meet regulatory expectations.
What Does Washing Produce Actually Remove?
At this point, the question isn’t whether washing produce is useful — it clearly is. The more relevant question is what it’s actually designed to do, and where its limits begin.
When we rinse fruits and vegetables, we’re dealing with what’s on the outside. Dirt, dust, and some surface-level pesticide residues can be reduced in this way, particularly when they haven’t bonded strongly to the plant. That’s why washing remains a consistent part of food safety advice.
But once we’re dealing with pesticides that have been absorbed into the plant, the situation changes. Washing doesn’t reach into the internal structure of the food, and it isn’t intended to. It’s a surface-level intervention, applied at the final stage before consumption.
That doesn’t make it ineffective — it just means it has a specific role. When we rely on it as a complete solution, particularly for substances that behave differently, we risk expecting more from it than it was ever designed to deliver.
Why Washing Isn’t a Complete Solution for Pesticides
At first glance, this might feel like a technical detail — the difference between what sits on the surface and what’s absorbed into the plant. But in practice, it changes how we think about the whole issue.
When advice like “just wash your produce” is repeated often enough, it starts to sound like a complete solution. It gives the impression that whatever might be present can be dealt with at the final step, right before we eat. That’s a reassuring idea, and it’s easy to see why it sticks.
Once we understand that not all pesticides behave in the same way, that sense of reassurance starts to shift slightly. Washing still has its place, but it’s no longer the full story. Instead, it becomes one part of a much broader system that begins long before food reaches our kitchens.
That shift in perspective doesn’t require alarm or drastic change. It simply invites a different way of thinking about where exposure might occur, and what steps are — and aren’t — designed to address it.
Does Cooking Remove Pesticides from Food?
At this point, it’s a question that often comes up naturally. If washing has its limits, perhaps cooking steps in to fill the gap.
It’s an easy assumption to make. Heat changes food in all sorts of ways — texture, flavour, even nutritional content — so it seems reasonable to think it might also break down or remove what we don’t want.
But much like washing, cooking isn’t a universal solution. While some substances can be reduced or altered by heat, that outcome depends on the specific chemical involved, how it behaves, and the conditions it’s exposed to. In the case of systemic pesticides, the issue isn’t just what’s on the surface, but what has already been taken up into the plant’s structure.
That doesn’t mean cooking has no effect at all. It simply means the answer isn’t as straightforward as we might hope — and it isn’t something that can be relied on as a complete fix.
Washing, Cooking, and Pesticides — What to Keep in Mind
None of this means you should stop washing your produce. It remains a sensible, everyday step for basic food hygiene. That part of the advice still holds.
But it does invite a slightly different way of looking at the bigger picture. When we’re dealing with pesticides that behave differently — particularly those that are absorbed into the plant — the idea of “removing” them at the final stage becomes less clear.
What this really highlights is where our focus tends to sit. Washing and cooking happen at the very end of the process, once the food is already in our hands. By that point, many of the decisions that shape what’s present have already been made earlier in the growing cycle.
That doesn’t mean there’s an easy answer, or a single step that resolves everything. It simply shifts the conversation. Instead of relying entirely on what we can do in the kitchen, it opens the door to asking broader questions about how food is produced, how residues are managed, and what assumptions we’ve come to accept without really examining them.
As more local testing data becomes available, that picture will continue to evolve — and in some cases, challenge what we think we know.
And sometimes, that shift in perspective is where a more meaningful understanding begins.
Image Source & Attribution
We’re grateful to the talented photographers and designers whose work enhances our content. The feature image on this page is by Louis Hansel. You can find more of their work here: https://unsplash.com/@louishansel.
