Dishwasher Not Cleaning Dishes? Here's Why

Dishes coming out of the dishwasher still dirty, greasy, or covered in white residue is frustrating — especially when you're running full cycles. The good news is that most dishwasher cleaning problems are caused by simple, fixable issues.

1. The Filter is Dirty

Most modern dishwashers have a filter at the bottom of the tub that traps food particles. When this filter is clogged, the same dirty water recirculates and re-deposits food on your dishes.

Fix: Locate the filter (usually a cylindrical mesh filter in the base of the tub), twist it out, and rinse under hot running water. Use a soft brush to remove stubborn buildup. Clean it every 2–4 weeks.

2. Spray Arms are Blocked

The spray arms distribute water throughout the dishwasher. If the small holes are blocked with food debris or mineral deposits, water won't reach all areas of the tub.

Fix: Remove the spray arms (usually by unscrewing or unclipping) and rinse under water. Use a toothpick to clear any blocked holes. Check both the lower and upper spray arms.

3. Using Too Little Detergent

Many people underfill the detergent compartment, which leads to poor cleaning performance.

Fix: Follow the detergent manufacturer's recommendations. For hard water areas (common in Western Sydney), you may need to use a bit more.

4. Using Low-Quality Detergent

Not all dishwasher tablets are equal. Budget no-brand tablets often don't dissolve properly or don't have enough enzyme action to break down grease.

Recommendation: Finish or Fairy Platinum tabs consistently perform best in Australian water conditions.

5. No Rinse Aid

Rinse aid helps water sheet off dishes and prevents spotting and cloudiness, especially on glassware. Without it, dishes often come out with white film.

Fix: Fill the rinse aid compartment and set the dispenser to the highest or second-highest setting if you have hard water.

6. Salt Reservoir is Empty (Hard Water Areas)

If your dishwasher has a salt compartment (most European-designed models do), the softener resin needs to be recharged regularly with dishwasher salt. Without it in hard water areas, mineral deposits build up on dishes and inside the machine.

Fix: Check the salt indicator light. Add dishwasher salt (not table salt) to the reservoir.

7. Dishes are Loaded Incorrectly

Nesting bowls, pots placed upside-down trapping water, and large items blocking the spray arm are common culprits.

Fix: Load bowls at an angle facing the center. Ensure nothing blocks the spray arm rotation. Place plates in the lower rack angled toward the center spray arm.

8. Water Temperature is Too Low

Dishwashers need water hot enough to dissolve grease — at least 55–60°C. If your water heater is set too low or the dishwasher's heating element is failing, cleaning will suffer.

Check: Run hot water at the kitchen tap for 30 seconds before starting the dishwasher to prime the pipes with hot water. If the dishwasher still underperforms, the heating element may need replacement.

9. Time for a New Dishwasher?

If your dishwasher is old, the pump or spray arm motor may be failing, or the door seals may be worn allowing heat to escape. When repair costs approach $300+, a replacement often makes more sense.

Oceania Appliances stocks quality used and refurbished dishwashers starting from $250, with free delivery across Sydney and a 3–6 month warranty. Call us on 0481 243 211 or shop online.