Why pH Matters: The Science Behind Yeronga Kitchen Lab's Alkalising Produce Soak

March 1, 2026

If you've ever wondered whether rinsing your strawberries under tap water is enough to help remove pesticides, the answer might surprise you. Water alone—especially Brisbane's neutral tap water—simply can't break down the waxy coatings and chemical residues that cling to your fresh produce.

The secret? pH.

At Yeronga Kitchen Lab, we've formulated our Alkalising Fruit & Vegetable Soak with food-grade ingredients that create the optimal alkaline environment to help lift pesticides, wax, and dirt from your produce. Here's the science behind why it works.

The Problem: Why Water Alone Isn't Enough

When you buy fresh produce—whether it's from Coles, Woolworths, or your local Brisbane farmers market—it often comes with invisible hitchhikers:

Pesticide residues (even on "washed" produce)
Waxy coatings applied to extend shelf life
Dirt and bacteria from handling and transport
Chemical preservatives

Brisbane's tap water has a neutral pH of around 7. While it's safe to drink, it's not chemically active enough to break down these stubborn residues. That's where alkaline pH comes in.

The Science: How Alkaline pH Helps Remove Pesticides

Most pesticides and waxes are lipophilic (fat-loving), meaning they stick to the surface of produce and resist water. To help remove them, you need to change the chemical environment.

Here's what happens when you use Yeronga Kitchen Lab's Alkalising Fruit & Vegetable Soak:

1. Alkaline pH Breaks Down Wax Coatings

Our bicarbonate of soda (sodium bicarbonate) creates a mildly alkaline solution with a pH of around 8.9 - 9.2. This alkaline environment:

Saponifies (breaks down) waxy coatings on apples, cucumbers, and capsicums
Emulsifies oily pesticide residues, allowing them to be rinsed away
Neutralises acidic chemical residues

2. Food-Grade = Safe for You, Effective for Cleaning

Unlike harsh chemical cleaners, Clean-Tucka uses 100% food-grade ingredients:

Bicarbonate of Soda (Sodium Bicarbonate): The same baking soda you use in cooking. It's alkaline, safe, and effective.
Food Grade Sodium Carbonate.
Citric Acid: Found naturally in lemons and limes. It creates the fizz and helps descale minerals.

The result? A produce wash that's tough on pesticides but gentle enough that you could literally eat it (though we don't recommend it!).

What the Research Says

Studies have shown that alkaline solutions are significantly more effective at helping remove pesticide residues than water alone:

A 2017 study published in the Journal of Agricultural and Food Chemistry found that a baking soda solution (pH 8.3) helped remove up to 96% of pesticide residues from apples after 12-15 minutes of soaking.
Water alone helped remove less than 50%.
The alkaline pH was particularly effective against thiabendazole and phosmet, two common pesticides used on Australian produce.

Yeronga Kitchen Lab's alkalising formula replicates this science in an easy-to-use, pre-measured format—so you get laboratory-grade cleaning without the guesswork.

Why "Food-Grade" Matters

You might be wondering: "Can't I just use any cleaning product?"

No—and here's why:

1. Safety

Food-grade ingredients are held to the highest purity standards. They're tested and approved for direct contact with food. Non-food-grade chemicals—even if they're "natural"—can contain:

Heavy metal contaminants
Industrial fillers
Harmful additives

When you rinse your produce, trace amounts of the wash remain. With Yeronga Kitchen Lab's food-grade formula, those traces are 100% safe to consume.

2. Effectiveness

Food-grade bicarbonate of soda is ultra-pure, meaning it dissolves completely and works more effectively than industrial-grade alternatives.

3. Environmental Impact

When you rinse your produce, the wash goes down the drain and into Brisbane's waterways. Our food-grade ingredients are:

100% biodegradable
Safe for marine life (if it's safe for you, it's safe for fish!)
pH-neutral once diluted, so it won't harm the Brisbane River or local creeks

Which Produce Needs It Most?

The Environmental Working Group (EWG) publishes an annual "Dirty Dozen" list of produce with the highest pesticide residues. In 2026, the top offenders include: