If the bottom rack comes out clean but the top rack is still dirty, you likely have a water flow issue — not a broken dishwasher. Start with these simple checks before calling a repair.
This is one of the most common dishwasher problems — and most people fix it in under 10 minutes.
Check my dishwasher issue (coming soon)
1. Try these first (0–2 minutes)
- Run the hot water at sink for 20–30 sec before starting a cycle
- Check top spray arm — does it spin freely?
- Use rinse aid if water is hard
- Make sure tall dishes aren’t blocking the spray arm
2. Most common causes of poor top rack cleaning
- Clogged spray arm holes
- Dirty filter reducing water pressure
- Bad loading pattern (blocking motion)
- Incoming water temperature too low
3. Clean the upper spray arm
- Remove top rack if needed
- Take off the spray arm — it usually clicks or unscrews
- Soak in warm water + vinegar for 15 minutes
- Use toothpick to clean the spray holes
- Reinstall and test manual spin — must move freely
4. Don’t forget the dishwasher filter
- Lift out lower rack
- Twist/pull out filter
- Rinse under warm water & scrub with old toothbrush
- Reinsert securely — must seal tightly
Helpful items for this fix
- Dishwasher-safe vinegar cleaner
- Replacement spray arms (for common brands)
- Rinse aid (for hard water)
- Filter cleaning brush
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5. Loading mistakes that block cleaning
These are often the real reason top dishes stay dirty:
- Large plates or cutting boards blocking spray arm
- Bowls facing wrong direction, catching water
- Too many items packed tightly together
- Utensils nested (spoons in spoons)
Soon, FixifyHome will include a “Check top rack issue” tool that guides your checks in order.
Dishwasher top rack cleaning – FAQ
Why is just the top rack still dirty?
Usually water pressure isn’t reaching the top — clogged spray arm or filter is the cause.
How often should I clean the filter?
Most homes should clean it about once a month.
Can low water temperature cause this?
Yes — detergent won’t activate properly if the water enters too cold.