How to Unclog a Dishwasher Spray Arm — Quick DIY Fix
Is your dishwasher leaving dishes dirty, spotty or not properly cleaned? One of the most common culprits is a clogged spray arm. The good news is that cleaning a spray arm is a simple DIY job that takes about 15–20 minutes.
What Is a Dishwasher Spray Arm?
Your dishwasher has one or two rotating spray arms (sometimes called wash arms) at the bottom and sometimes at the top. These spin during a wash cycle and shoot water through small holes to clean your dishes. Over time, the holes get blocked by food particles, mineral deposits and limescale.
Signs Your Spray Arm Is Clogged
- Dishes on the top rack not getting clean
- Bottom rack dishes still dirty after a full cycle
- Water spots or residue on glasses and plates
- The spray arm doesn't spin freely when you check it by hand
How to Clean a Clogged Dishwasher Spray Arm
Step 1: Remove the Spray Arm
The lower spray arm usually just lifts off or unscrews counter-clockwise. For top rack spray arms, you may need to unclip the top rack first. Check your dishwasher's manual if unsure — or search the model number online.
Step 2: Rinse Under Running Water
Hold the spray arm under the tap and rinse to clear loose debris. Spin it to see if water flows freely through all holes.
Step 3: Clear Each Hole
Use a toothpick, thin skewer or cocktail stick to poke through each spray hole. You'll often dislodge small food particles, bits of glass or mineral deposits. Work through every hole systematically.
Step 4: Soak in White Vinegar
For stubborn mineral deposits and limescale, soak the spray arm in a bowl of undiluted white vinegar for 20–30 minutes. This dissolves calcium build-up. After soaking, rinse and check the holes are clear.
Step 5: Rinse and Reinstall
Rinse thoroughly under running water. Spin the arm to confirm all holes are clear. Reinstall the arm by clicking it back into place.
Step 6: Run a Test Cycle
Run the dishwasher with a normal cycle and check the results. Use a dishwasher cleaner tablet in this cycle to flush out the rest of the system.
Preventing Future Blockages
- Always scrape food off plates before loading (don't pre-rinse, just scrape)
- Use a dishwasher cleaner monthly
- Clean the filter at the bottom of your dishwasher monthly
- Use a rinse aid to prevent mineral deposits building up on spray holes
When to Get Professional Help or Replace
If your dishwasher still doesn't clean properly after cleaning the spray arm, the issue may be a faulty wash pump, blocked drain or failing heating element. At that point, consider whether your machine is worth repairing.
Oceania Appliances stocks quality tested second-hand dishwashers from $280, with a 3–6 month warranty and Sydney-wide delivery.