How to effectively descale your dishwasher

Your dishwasher is a workhorse in your kitchen, saving you time and effort by taking care of the dirty dishes. Sometimes, minerals from your water can build up inside your dishwasher, which can lead to scale deposits. Dishwasher performance and lifespan can be impacted by this buildup. Regular descaling is essential to keep your dishwasher running efficiently and effectively. In this guide, we’ll walk you through the steps to effectively descale your dishwasher and keep it in top condition.

What is dishwasher scale?

Scale forms when hard water evaporates, leaving behind mineral deposits such as calcium and magnesium. Deposits that accumulate in your dishwasher can lead to issues caused by limescale buildup such as:

• Reduced cleaning efficiency – Your dishes may come out with spots or residue.
• Clogged spray arms.
• Reduction in heating efficiency, making the dishwasher work harder.
• Damaged internal components like heating elements and pumps.
• Unpleasant smells caused by trapped food particles and scale.
• Dull and streaky glassware.

How often should you descale your dishwasher?

Descaling removes mineral deposits, allowing your dishwasher to perform at its best. Descaling and deep cleaning your unit is an easy maintenance task that should be done regularly.

If you have hard water, descale your dishwasher every 1 to 3 months.  Some dishwasher models have in built softeners and use softener salt to help mitigate hard water build-up. With softer water, descaling every 6 months is enough. Check with your local water utility or use a home water testing kit to test your water hardness.

Signs that your dishwasher needs descaling

Not sure if your dishwasher needs descaling? Here are some common signs to look out for:

• Cloudy or spotted glassware: If your dishes and glassware are coming out with spots or a cloudy film, it could be a sign of mineral buildup.
• Reduced cleaning performance: Scale buildup can block water flow, leading to poor cleaning results.
• Longer cycle times: A dishwasher struggling with scale buildup may take longer to complete cycles.
• Unusual noises: As a result of scale buildup, your dishwasher may produce unusual noises, particularly during the wash and rinse cycles

If you notice any of these signs, it’s time to descale your dishwasher.

Step-by-step guide to descaling your dishwasher

Step 1: Empty the dishwasher

Start by removing all dishes, utensils, and racks from your dishwasher. This will help the descaling solution reach every corner.

Step 2: Clean the filter and spray arms

Give the dishwasher filter a good clean. The filter is usually located at the bottom of the dishwasher and can be removed by twisting or lifting it out. Rinse the filter under warm water. This will remove any food particles and debris. If it’s particularly dirty, you can soak it in warm, soapy water for a few minutes, before scrubbing with a soft brush.

Next, check the spray arms for clogs. Food particles and mineral deposits can block the spray holes, reducing water flow. Remove the spray arms and use a toothpick or a small brush to clear any debris from the holes.

Check out our detailed guide to cleaning your dishwasher filter on our blog.

Step 3: Choose your descaling solution

We recommend a commercial descaler, suited for dishwashers. Aktivo Dishwasher/Washing Machine Descaler is a safe and easy option that will effectively remove lime scale and grime. It will also sanitise and deodorise your dishwasher.

Step 4: Run a cleaning cycle

Follow the manufacturer’s instructions on the product packaging. Most commercial descalers are added to the bottom of the dishwasher or placed in the detergent compartment. Run a full cycle with hot water to allow the descaler to work its magic.

Step 5: Wipe down the interior

After the cleaning cycle is complete, open the dishwasher and wipe down the interior with a soft cloth or sponge. Pay special attention to the door seals and edges where deposits can accumulate.

Step 6: Run a rinse cycle

To ensure all traces of the descaling solution are removed, run an additional rinse cycle with just hot water. This will help flush out any remaining residue and leave your dishwasher ready for use.

Tips for preventing scale buildup

Try our tips to help prevent future scale buildup:

• Descale and deep clean your dishwasher regularly.
• Clean your dishwasher filter and spray arms monthly. This will help to prevent clogs and maintain optimal performance.
• To ensure spray arems can rotate properly and water reaches all surfaces, do not load dishes too close together.
• Use a rinse aid to help prevent mineral deposits from forming on your dishes and the interior of your dishwasher.

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