How to Clean Dishwasher Spray Arms for Better Cleaning

If your dishes still come out dirty after a full cycle, learning how to clean dishwasher spray arms is a good place to start. Spray arms push water through small holes to clean the top and bottom racks. When those holes get blocked by food, grease, or mineral buildup, water may not spray evenly. In this guide, BlueStars Parts will show you how to clean dishwasher spray arms safely and decide when replacement may be needed.

Quick Answer: How Do You Clean Dishwasher Spray Arms?

Remove the upper and lower spray arms, clear each hole with a toothpick or soft brush, soak them in warm water and white vinegar for 20-30 minutes, then rinse and reinstall. Here's the process at a glance:

1. Signs your dishwasher spray arms need cleaning

Before removing the spray arms, take a few minutes to confirm whether the spray arms are really causing the cleaning problem. Dirty dishes can also come from a clogged filter, low water temperature, hard water buildup, weak water pressure, or poor rack loading.

>> Related guide: Dishwasher Not Getting Water? 5 Causes and Fixes

If only the top rack is dirty, start with the upper spray arm. If the bottom rack is not clean, check the lower spray arm first. If both racks are affected, clean the filter and inspect both spray arms.

Stop running the dishwasher if:

• A spray arm is cracked or split

• The spray arm hits the rack or dishes while spinning

• The arm falls off during the cycle

• Water sprays from the mount instead of the spray holes

• You hear scraping, knocking, or repeated rattling inside the dishwasher

Quick decision: If the spray arms are blocked or not spinning, clean them first. If the filter is dirty, clean the filter before replacing parts. And in case, large dishes block the spray arm path, reload the dishwasher and run another test cycle.

These signs may mean the spray arm or mount is damaged, not just clogged. Running another cycle may reduce cleaning performance or damage nearby parts.

2. How to clean dishwasher spray arms

Cleaning dishwasher spray arms is usually a simple DIY task. You only need a few basic items and a little time to remove buildup from the spray holes.

What you may need:

• Soft brush or old toothbrush

• Toothpick or thin plastic pick

• White vinegar

• Warm water

• Small bowl or sink

• Clean towel

Safety note: Turn off the dishwasher (and, for extra caution, disconnect it from power) before removing any parts. Avoid sharp metal tools that can enlarge or damage the spray holes, and never mix vinegar with bleach or other harsh chemical cleaners.

Step 1: Remove the upper and lower spray arms

Turn off the dishwasher and pull out the racks so you can reach the spray arms. Most lower spray arms lift off, twist off, or release with a small locking tab. Upper spray arms may be attached under the top rack or connected to a spray arm mount.

Check your dishwasher manual if the arm does not come off easily. Do not force the part, because the clips or mount can crack.

Quick test before removing: Spin each spray arm by hand. If the arm hits a dish, rack, or utensil, the issue may be poor loading rather than a damaged spray arm. Rearrange the dishes and test again before removing or replacing any part.

Removing the dishwasher racks gives you clear access to the upper and lower spray arms before cleaning. (Source: Freepik)

Step 2: Inspect each spray hole

Hold each spray arm under good light and look closely at the spray holes. Food particles, seeds, grease, and hard water minerals can block the openings. Also check the center mount area, because buildup there can stop the arm from spinning smoothly.

Common signs of clogged spray arm holes:

• Some holes look white or crusty

• Water sprays weakly from one side

• Dishes on one rack stay dirty

• The spray arm spins slowly or not at all

• Small food particles are stuck in the nozzles

Quick test: Hold the spray arm up to the light and check whether the holes are clearly open. If several holes look white, crusty, or blocked with food particles, cleaning is likely needed before replacement.

Step 3: Clear each blocked hole

Use a toothpick, plastic pick, or soft brush to gently loosen debris from each blocked hole. Push debris out carefully instead of forcing it deeper into the spray arm. If the buildup is heavy, rinse the arm under warm running water while clearing the holes.

Quick test: Hold the spray arm under running water and check whether water flows out of the holes evenly. If only a few holes spray water, continue cleaning before reinstalling the part.

Clearing blocked spray arm holes helps restore even water flow and improve dishwasher cleaning performance. (Source: BlueStars Parts)

Step 4: Soak in white vinegar solution

Soak the spray arms in a mixture of warm water and white vinegar for 20 to 30 minutes. This helps loosen mineral buildup and greasy residue inside the small openings. After soaking, scrub the holes again with a soft brush and rinse thoroughly.

If you live in a hard water area, the mineral scale may come back faster. In that case, cleaning the spray arms regularly can help maintain better water flow.

Step 5: Rinse and reinstall the spray arms

Rinse each spray arm with clean water and shake out any loose debris. Reinstall the upper and lower spray arms in their correct positions, then spin them by hand to make sure they move freely. Make sure nothing from the racks blocks their movement.

Quick test after reinstalling: Spin the upper and lower spray arms by hand again. They should rotate freely without wobbling, scraping, or hitting dishes. If an arm feels loose, falls off, or does not stay in place, check the mount, bearing, or locking point.

If the upper spray arm mount is cracked, clogged with mineral scale, or no longer holds the spray arm securely, the 8539324 Dishwasher Upper Spray Arm Mount Replacement can be a suitable option for select compatible Whirlpool and Kenmore dishwasher models. Always check your dishwasher model number, spray arm position, and part compatibility before ordering.

If the lower spray arm is cracked, warped, clogged, or no longer distributing water evenly, the 5304517982 Dishwasher Lower Spray Arm may help restore proper water spray for select compatible dishwasher models. Confirm the part number and model fit before buying a replacement.

The 5304517982 Dishwasher Lower Spray Arm helps distribute water across the lower rack for better cleaning. (Source: BlueStars Parts)

Step 6: Run a test cycle

After reinstalling the spray arms, run a short rinse or wash cycle with the dishwasher empty. Listen for smooth spinning and check whether the spray arms stay in place. After the cycle, inspect the arms again to confirm they did not loosen or fall off.

Quick test after the next wash cycle: Run a short cycle with the dishwasher empty or lightly loaded. If cleaning improves, the issue was likely clogged spray holes or blocked spray arm movement. If dishes still come out dirty, check the dishwasher filter, water temperature, detergent, hard water buildup, and rack loading before replacing the spray arm.

If the dishwasher also stops mid-cycle, shows an error code, or leaves standing water instead of draining, the problem is likely unrelated to the spray arms - see How to Reset a GE Dishwasher Control Panel in 5 Steps for GE models or LG Dishwasher Won't Drain? Simple Troubleshooting Guide for LG models.

3. When to replace the spray arm

Cleaning fixes most spray arm problems, but replacement may be needed if the part is damaged or worn. Use the table below to decide whether cleaning is enough or a new part is required.

3.1. Cracked or split spray arm

Common signs:

• A split seam or crack visible along the arm
• Water spraying from the side of the arm instead of the holes
• Weaker cleaning results, especially on the rack closest to the damaged arm

How to fix: A cracked spray arm leaks water before it reaches the spray holes, so cleaning will not solve the problem. Replace it with a compatible part. Do not keep using a damaged arm if it hits the rack, falls off, or sprays water unevenly.

Replacing a cracked or split spray arm can restore proper water pressure and prevent uneven dishwasher cleaning. (Source: BlueStars Parts)

3.2. Warped spray arm

Common signs:

• The arm rubs against the rack while spinning
• Spinning is uneven or the arm stops moving mid-cycle
• Poor cleaning results even though the spray holes are clear

How to fix: Heat, age, or contact with large dishes can cause a spray arm to warp. If the arm does not spin freely after cleaning and reinstalling, replacement is usually the better fix than continued cleaning.

3.3. Worn spray arm mount or bearing

The spray arm mount or bearing holds the spray arm in place while letting it rotate smoothly. If this part is worn, cracked, loose, or clogged with mineral scale, the spray arm may wobble, fall off, or stop spinning properly - a problem that is especially common when a rack is still not getting clean after the spray holes have been cleared.

Common signs:

• The spray arm feels loose or unstable
• The spray arm falls off during the cycle
• The arm wobbles instead of spinning smoothly
• Water sprays from the connection point instead of the spray holes
• The upper or lower rack still comes out dirty after cleaning

How to fix: Once a worn mount, bearing, or damaged spray arm is confirmed, use a model-compatible replacement to restore proper water spray and rack cleaning. Always check your dishwasher model number, spray arm position, and part compatibility before ordering.

• The 8539324 Dishwasher Upper Spray Arm Mount Replacement may be suitable for select compatible dishwasher models when the upper spray arm feels loose, falls off, wobbles, or no longer spins securely.
• The 5304517982 Dishwasher Lower Spray Arm can be used when the lower spray arm is cracked, warped, clogged, or no longer spraying water evenly across the bottom rack.
• Browse BlueStars dishwasher parts for other compatible replacement options for your dishwasher model.

The 8539324 Dishwasher Upper Spray Arm Mount keeps the upper spray arm secure and rotating smoothly. (Source: BlueStars Parts)

4. How to prevent spray arm clogs

Once the spray arms are clean, a few simple habits can help prevent the holes from clogging again. These steps also help keep water moving smoothly inside the dishwasher.

4.1. Scrape food from dishes before loading

You don't need to fully wash dishes before loading them, but scrape off large food pieces first. Seeds, rice, pasta, and small bones can get trapped in the filter or spray arm holes.

4.2. Clean the dishwasher filter regularly

A dirty filter lets food particles recirculate during the wash cycle, and those particles can end up inside the spray arms and block the holes. Clean the filter according to your dishwasher manual, especially if you often see grit on dishes.

>> Related guide: Cleaning Dishwasher Hose: 6 Simple Steps for Better Drainage

4.3. Avoid blocking spray arms with large dishes

Large pans, cutting boards, or tall utensils can stop the spray arms from spinning. Before starting a cycle, spin the spray arms by hand to confirm they move freely. If an arm hits a dish, reload the rack before running the dishwasher.

4.4. Run hot water before starting the dishwasher

Hot water dissolves grease and detergent more effectively. Before starting the dishwasher, run the kitchen sink's hot water for a short time until it warms up, so the dishwasher begins its cycle at a better cleaning temperature.

4.5. Use dishwasher cleaner monthly

A monthly dishwasher cleaner reduces grease, odor, and mineral buildup - especially useful if you run the dishwasher daily or live in a hard water area.

4.6. Check for hard water or mineral buildup

Hard water can leave white scale around the spray holes and inside the spray arm. If you notice cloudy dishes, white residue, or crusty buildup, mineral deposits may be part of the problem. Regular vinegar soaking and dishwasher cleaner help, but severe hard water may need a water treatment solution.

Decision tree - should you clean or replace?

 

5. FAQs

5.1. How often should I clean dishwasher spray arms?

Clean dishwasher spray arms every 2 to 3 months, or sooner if dishes come out dirty, gritty, or cloudy, or if the spray holes look blocked or the arms aren't spinning properly.

5.2. Why are my dishwasher spray arms not spinning?

They may be blocked by large dishes, clogged with debris, or installed incorrectly. A worn spray arm mount, low water pressure, or a damaged spray arm can also stop normal spinning.

5.3. Can clogged spray arms cause a dishwasher to not clean dishes?

Yes. Clogged spray arms stop water from spraying evenly across the racks, which can leave dishes with food residue, gritty particles, or cloudy spots after a full wash cycle.

5.4. What is the best way to unclog dishwasher spray arm holes?

Remove the spray arms, clear each hole with a toothpick or soft brush, soak the parts in warm water and white vinegar, then rinse and reinstall them. Avoid sharp metal tools, since they can damage the spray holes.

5.5. When should I replace my dishwasher spray arms instead of cleaning them?

Replace them if they are cracked, split, warped, loose, or still not spraying evenly after cleaning. Replace the mount too if the spray arm falls off, wobbles, or no longer spins securely.

Clean first, replace only when necessary - that's the fastest fix for poor cleaning, gritty dishes, or weak spray, as long as a dirty filter, hard water, or blocked dishes aren't the real cause. For reliable dishwasher replacement parts, explore BlueStars Parts and always confirm your dishwasher model number before ordering.

Contact Information:

8 The Green, Ste A, Dover, Delaware 19901-3618, United States

Website: https://bluestarsparts.com/ 

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References:

• Bosch Home Appliances. (n.d.). Dishcare tips and tricks — How to clean spray arms. Bosch. https://bosch-home.com/us/experience-bosch/tips-and-tricks/all-articles/how-to-clean-dishwasher-spray-arms
• AppliancePartsPros.com. (2024, February 15). How to clean dishwasher spray arms. https://www.appliancepartspros.com/b/?p=7290
• Zanussi Support. (2024, March 12). How to clean, disassemble and assemble your dishwasher spray arms. https://zanussi.co.uk/support/support-articles/ecodesign/ecodesign-dishwashing/spray-arms/how-to-clean-disassemble-and-assemble-your-dishwasher-spray-arms