Why Is There a White Film on the Bottom of My Dishwasher?

Many homeowners find white film on the bottom of their dishwashers and panic. If you've opened your dishwasher lately and wondered why it's covered in white gunk, we're here to help. White dishwasher residue is typically harmless and easy to remove, so relax. We'll explain what causes this unsightly buildup and give you tips on how to remove white film from your dishwasher.

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Why Is There a Gross White Film on the Bottom of My Dishwasher?

That gross white film forms when hard water evaporates. Hard water has a high mineral content, so it's loaded with magnesium and calcium. After your dishwasher heats up and sprays water inside, the drying process begins. The dried minerals turn into a white film that can coat the bottom, sides or top of your dishwasher.

Your dishwasher's spray arms and heating element may also end up coated with this white dishwasher residue. Residue can even form on clean dishes. This white film can be gross, but it's just mineral buildup.

What Is White Dishwasher Residue?

The official name for white dishwasher residue is limescale. Limescale occurs when the minerals in hard water crystallize, leaving behind a white film.

• The film can take on different appearances, including:

• A chalky or powdery coating

• A flaky film

• Grainy residue

• A cloudy haze on dishes or silverware

• Gritty white particles on surfaces

Have you ever taken a bath and noticed a ring around the tub after draining the water? Think of limescale as the dishwasher equivalent, only more concentrated. Dishwashers can get hotter than bathwater and run longer, so the mineral-binding process happens faster. Basically, your dishwasher is its own worst enemy when it comes to preventing white residue.

Why Is My Dishwasher Leaving White Residue?

Hard water is typically the main culprit, but other factors play a role. Here are some potential causes to keep an eye out for.

Detergent Problems

Too much detergent can be tough for your dishwasher to rinse away. You may also notice issues if you don't use enough detergent. If you skimp on detergent, you might notice a greasy residue on dishes or in your dishwasher. Worse yet, soap scum may mix with minerals from your home's hard water, creating a thick, crusty white film.

It's also important to choose the right dishwasher for your system. Look for dishwasher detergent labeled "hard water friendly" or with "lime-fighting power" if you don't have a water softener installed. These detergents help break down the minerals that cause white scale in dishwashers.

Hot Water

Homeowners often run dishes on the hottest setting so kitchen essentials are clean and sanitized. Unfortunately, this can cause hard water stains in a dishwasher or a cloudy film on dishes. High heat accelerates the crystallization process for minerals, encouraging dishwasher residue and buildup.

Filter Problems

Your dishwasher filter captures chunks of yesterday's dinner and the coffee grounds from your favorite mug. If you don't clean this filter regularly, debris will recirculate through your dishwasher. A clogged filter can cause mineral buildup in a dishwasher.

Lack of Rinse Aid

Water often clings to dishes without rinse aid. If water clings to your favorite bowl, so will residue-causing minerals. Ensure your rinse aid dispenser is in good condition, and don't forget to refill it as needed.

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How Do You Get Rid of This White Residue?

Wondering how to remove white film from a dishwasher? You typically don't need harsh chemicals or tools. After cleaning the filter, choosing the right detergent and adding rinse aid, here are some solutions you can try.

Vinegar

Vinegar can dissolve stubborn residue, including mineral buildup in a dishwasher. Pour a cup or two of vinegar into a dishwasher-safe bowl and place it upright on the top rack of the dishwasher. Run a full cycle using hot water and let the vinegar work its magic.

Baking Soda

Baking soda can gently yet effectively scrub away dishwasher residue. Sprinkle a cup of baking soda in the bottom of your dishwasher and run a short rinse cycle with hot water.

Limescale Remover

Sometimes home remedies aren't powerful enough for stubborn white scale in a dishwasher. If needed, use a store-bought limescale remover or descaler according to the product's instructions.

Spray Arm Cleaning

Check your dishwasher's manual for instructions on removing and cleaning the spray arms. Clogged or dirty spray arms struggle to rinse away dishwasher residue and may be the culprit behind a white film on the bottom of the dishwasher.

How Do You Prevent White Film From Forming in a Dishwasher?

Dishwasher residue can be frustrating, but it's often preventable. Use the right detergent, and don't forget rinse aid. Keep your dishwasher filter and spray arms clean, and clean your dishwasher with a store-bought or homemade descaler once a month. If hard water stains in your dishwasher continue, consider having a professional install a water softener.