How to Use Your Washer’s App to Optimize Detergent Use

You’ve probably stared at that tiny detergent drawer, wondering if you’re over‑pouring, under‑pouring, or just wasting money. In 2024, most new washers come with a companion app that can actually tell you the perfect amount of soap for each load. If you’ve ever watched a sudsy flood in the drum or a stubborn stain that refuses to budge, this guide is for you.

Why the App Matters Right Now

Energy bills are climbing, and manufacturers are pushing “smart” features to help us cut waste. The detergent‑optimizing function is one of the most tangible ways a connected washer can save you cash and the planet. Plus, with the rise of high‑efficiency (HE) detergents, using the right dose is more critical than ever—too much can leave residue, too little leaves grime.

Getting Started: Pairing Your Phone and Washer

Install the Right App

Most brands have a dedicated app—LG ThinQ, Samsung SmartThings, Whirlpool U‑Connect, etc. Download it from the App Store or Google Play, create an account, and follow the on‑screen QR‑code scan to link the machine. If you’re like me and have a “multiple‑device” household, give each washer a nickname (e.g., “Laundry Lab” for the upstairs unit) so you don’t mix up settings.

Enable Detergent‑Dose Recommendations

During the initial setup, you’ll be prompted to enter a few details:

Load capacity – measured in kilograms or pounds.
Water hardness – many apps pull this from your location, but you can also test with a simple strip kit.
Detergent type – HE powder, liquid, or pod.

Enter the exact brand and concentration if you know it; the app’s algorithm uses that data to calculate the optimal dose.

The Science Behind the Dose

How Sensors Talk to the Cloud

Smart washers have load‑sensing sensors that weigh the laundry before the cycle starts. They also measure water temperature, spin speed, and even the amount of suds generated during the first few minutes. All that data is sent to the cloud where a machine‑learning model compares it against a massive database of previous washes.

What “Optimal” Means

Optimal dose is the smallest amount of detergent that still achieves the target cleaning performance. The model balances three factors:

Stain level – the app asks you to select “light,” “normal,” or “heavy” on the load screen.
Water hardness – hard water needs a bit more soap to form effective cleaning bubbles.
Energy efficiency – less soap means less rinsing, which reduces water usage and shortens cycle time.

Step‑by‑Step: Using the App During a Load

Open the app and select “Start New Load.”
Choose fabric type – cotton, synthetics, delicates. The app adjusts agitation and spin accordingly.
Pick stain level – if you’re unsure, “normal” is a safe default.
Confirm detergent type – the app will display a suggested amount in milliliters (for liquid) or grams (for powder).
Press “Send to Washer.” The machine receives the parameters and pre‑loads the exact dose into the dispenser, if it’s a model with an automatic detergent drawer.

If your washer doesn’t have an automatic dispenser, the app will still show the recommended amount on your phone. Just measure it out with the scoop that came with your detergent and pour it into the drawer.

Real‑World Tips from My Laundry Lab

1. Keep the Detergent Drawer Clean

Residue builds up over time and can throw off the sensor’s reading. I wipe the drawer weekly with a damp cloth and a splash of vinegar. It only takes a minute, and the app’s dose suggestions become more reliable.

2. Don’t Forget to Update Firmware

The app’s algorithm improves with each firmware update. I set my phone to auto‑install updates, and the washer usually reboots at night. A quick check in the app’s “Device Info” screen tells you if you’re on the latest version.

3. Use the “Eco‑Mode” When Possible

Eco‑Mode reduces water temperature and spin speed, which means the app will suggest a slightly lower detergent dose. For everyday loads that aren’t heavily soiled, Eco‑Mode can cut detergent use by up to 30% without sacrificing cleanliness.

4. Test Water Hardness Annually

If you move or notice more mineral buildup on fixtures, run a water‑hardness test kit. Updating the app with the new value can prevent over‑detergent scenarios that lead to soap scum on clothes.

Common Misconceptions

“More soap = cleaner clothes.” Not true with HE washers. Excess suds can trap dirt, leaving stains behind.
“The app is just a gimmick.” I ran a side‑by‑side test: a 5‑kg load of mixed cotton and polyester, using the app’s recommendation versus my usual “cup‑full” habit. The app‑guided load used 25% less detergent and still passed the stain‑removal test (I spilled coffee on a white tee on purpose).
“Only new detergents work.” The app can calibrate for older formulas as long as you input the correct concentration.

When to Override the App

There are a few scenarios where you might want to tweak the dose:

Delicate fabrics – a tiny reduction can protect fibers.
Heavy‑soil items – a modest increase (10‑15%) can help break down grease.
Allergy‑sensitive households – some people prefer fragrance‑free or hypoallergenic detergents that require a bit more volume to achieve the same cleaning power.

In each case, adjust the amount directly in the app before you hit “Start.” The interface usually has a “+/-” button for fine‑tuning.

Bottom Line

Your washer’s app is more than a fancy notification system; it’s a data‑driven tool that can shave off detergent waste, lower water usage, and keep your clothes looking fresh. By taking a few seconds to input the right parameters and following the app’s recommendations, you’ll see a noticeable dip in your detergent bill and a lighter environmental footprint.

Give it a try on your next load. You might be surprised how much you can save with a little digital help.