Why Your Dishwasher Isn't Cleaning Dishes Properly

Few things are more frustrating than unloading your Miele, Bosch, or Thermador dishwasher only to find spotted glasses and food residue on plates. Let's diagnose why this happens and how to fix it.

Common Causes of Poor Cleaning

1. Water Temperature Issues

Your dishwasher needs hot water (120-150°F) to clean effectively:

Run hot water at the kitchen sink before starting

Check your water heater setting

Older water heaters may not maintain consistent temps

Long pipe runs from heater to dishwasher cool water

2. Spray Arm Problems

The spray arms distribute water throughout the dishwasher:

Clogged holes: Food particles block spray jets

Cracked arms: Reduce water pressure

Blocked rotation: Dishes or racks obstruct movement

DIY Fix: Remove spray arms and clean with a toothpick or small brush

3. Filter Issues

Modern dishwashers have filters that need regular cleaning:

Locate your filter (usually at the bottom)

Remove and rinse under running water

Clean weekly for best results

Replace damaged filters

4. Detergent Problems

The wrong detergent can cause issues:

Use only dishwasher-specific detergent

Don't use too much (causes residue)

Store detergent properly (humidity affects it)

Consider your water hardness

5. Loading Mistakes

How you load affects cleaning:

Don't block the spray arms

Face soiled surfaces toward center

Don't nest items together

Give delicate items space

Premium Dishwasher Specific Issues

Miele Dishwashers

Common problems we see:

AutoDos system issues

Intake valve failures

Spray arm bearing wear

Display errors

Bosch/Thermador Dishwashers

Watch for:

Circulation pump problems

Aqua sensor malfunctions

Drain issues

Heat pump problems (on some models)

Cove Dishwashers

Sub-Zero's dishwasher brand needs:

Regular filter maintenance

Proper rack configuration

Rinse aid refills

Periodic diagnostic checks

When Cleaning Won't Fix It

Professional service is needed for:

Wash motor failures

Water inlet valve problems

Control board issues

Heating element failures

Persistent error codes

Prevention Tips

Daily Habits

Scrape (don't rinse) dishes before loading

Run hot water before starting

Use rinse aid consistently

Don't overload

Monthly Maintenance

Clean filters

Wipe door seals

Clean spray arms

Run empty hot cycle with cleaner

Greenwich Dishwasher Service

We service all premium dishwasher brands throughout Greenwich:

Same-day diagnostics

Factory-trained technicians

1-year warranty on repairs

All neighborhoods served

Call (475) 281-3784 for professional dishwasher repair.

*24/7 emergency service. Serving Greenwich, Old Greenwich, Riverside, and Cos Cob.*