If your dishwasher isn’t getting dishes as clean as it once did, you’re not alone. Over time, even the most reliable machines can lose their sparkle—literally. But before you call for repairs or start shopping for a replacement, there are several things you can check on your own. Often, the issue is something simple that you can fix with a little maintenance and attention.
Here are the most common reasons your dishwasher may not be performing like it used to—and what you can do about it.
- Clogged Spray Arms
The spray arms are responsible for blasting water onto your dishes. Over time, food particles, hard water minerals, and soap scum can clog the tiny holes in these arms, reducing water pressure and cleaning effectiveness.
What to check:
Remove the spray arms (usually they just twist off) and inspect the holes. If they’re clogged, soak the arms in warm vinegar or use a toothpick to gently clear the debris.
- Dirty Filter
Most modern dishwashers have a filter at the bottom to catch food particles and prevent them from recirculating. If it’s full or clogged, water won’t drain properly, and your dishes may come out grimy.
What to check:
Locate and remove the filter (usually under the bottom spray arm), rinse it under warm water, and scrub away any buildup with a soft brush. Make this a habit every month or two to keep things running smoothly.
- Incorrect Loading
It may sound basic, but loading your dishwasher improperly can block water flow and keep certain dishes from getting clean. Overstuffing, nesting bowls, or blocking the spray arms are common issues.
What to check:
Make sure dishes aren’t overlapping, cups are tilted downward, and nothing is obstructing the spray arms. Give each item enough space so water can reach every surface.
- Low Water Temperature
Dishwashers clean best when the water is at least 120°F (49°C). If your water isn’t hot enough, greasy or grimy residue may not wash away effectively.
What to check:
Run hot water in your kitchen sink before starting the dishwasher to bring hot water to the line. You can also check your water heater’s temperature settings to ensure it’s warm enough.
- Old or Ineffective Detergent
Detergent can lose its potency over time, especially if it’s stored in a humid area or used past its expiration date. In addition, some newer, eco-friendly detergents may not work as well in hard water conditions.
What to check:
Try a fresh detergent or a different brand. Consider using a rinse aid to help reduce spots and film, especially if you have hard water.
- Mineral Buildup and Hard Water
If you live in an area with hard water, mineral deposits can build up on internal components, clog spray arms, and leave a film on dishes.
What to check:
Use a dishwasher cleaner or run an empty cycle with white vinegar once a month. Installing a water softener or using a dishwasher additive made for hard water can also help.
- Worn or Failing Components
Over time, parts like the pump, heating element, or detergent dispenser can wear out. If your dishwasher still isn’t performing after basic maintenance, you might be dealing with a mechanical issue.
What to check:
Listen for unusual noises, watch for standing water, or check if the detergent door is releasing properly. If something seems off and you’ve ruled out the basics, it may be time to call a technician.
Final Thoughts
A poorly performing dishwasher is frustrating, but it doesn’t always mean your appliance is on its last leg. With a little detective work and routine maintenance, you can often restore its cleaning power without spending a fortune.
Start with the easy fixes—clean the filter, inspect the spray arms, check the water temperature—and you might be surprised how quickly things improve.
