How to Deep Clean a Bosch Dishwasher

Bosch uses a triple-filter design rather than the single filter found on budget machines, so it needs a specific routine to keep glassware clear and odours away. This covers the 300, 500, and 800 series: the filter stack, spray arms, door gasket, and tub.

Tools and supplies#

Safety warning: Disconnect power at the breaker or unplug the unit before cleaning the filter area. The sump area beneath the filter contains the heating element which may still be hot after a recent cycle.

Step-by-step#

1. Pull the lower rack and spray arm#

Slide the lower rack out and set it aside. The Bosch lower spray arm lifts straight off its post — grip the center hub and pull up. Rest it on a towel by the sink.

2. Lift out the triple-filter#

The filter stack sits at the bottom center of the tub in three parts: a coarse cylindrical mesh, a flat fine filter around it, and a microfilter in the base. Turn the cylindrical mesh a quarter turn counterclockwise (follow the moulded arrow) and lift it out, then lift the flat fine filter by its edge.

3. Scrub the mesh filter#

Hold the cylindrical mesh under warm running water and brush it from the outside in, working the bottom rim where grease collects. For stubborn film, soak it in warm water with a few drops of dish soap for ten minutes and brush again. Never use abrasive pads — the fine mesh tears.

4. Clean the fine filter and microfilter#

Rinse the flat fine filter gently and brush lightly; held to the light it should pass light evenly, and dark patches mean embedded grease that needs soaking. Wipe the microfilter plate at the base with a damp cloth and sponge any standing water from the sump.

5. Clear the spray arms#

Inspect every jet on each arm and clear blocked holes with a wooden toothpick or skewer — never metal, which enlarges the holes and drops pressure. Flush water through the center to push debris out. The upper arm unscrews at its center nut counterclockwise.

6. Wipe the door gasket and lower edge#

Pull the door gasket gently from the tub and wipe inside the fold, concentrating on the bottom corners where water pools. Clean the bottom edge of the door too — it sits below the water line and the wash never reaches it.

7. Run a vinegar cycle#

Refit the fine filter, then lock the cylindrical mesh with a quarter-turn clockwise, and replace the spray arms. Stand a bowl of white vinegar on the upper rack and run the hottest cycle (Heavy or Sanitize) with the machine otherwise empty to cut mineral scale and grease film.

8. Deodorise with baking soda#

Sprinkle baking soda across the tub floor and run a short hot cycle (Quick Wash or Rinse). It neutralises leftover vinegar, brightens the stainless interior, and clears lingering smells.

9. Clean the ActiveWater sensor#

The 500 and 800 series carry an ActiveWater turbidity sensor in the sump — a small clear dome near the drain. If cycles have been running long, wipe the lens gently with a soft damp cloth and no chemicals.

10. Finish the exterior#

Wipe the stainless door with the grain using a damp cloth, and clean the control panel with a barely-damp cloth only so moisture cannot seep behind the buttons.

Maintenance schedule#

When to call a professional#

EasyBear technicians serving Sacramento and the Bay Area carry Bosch-specific diagnostic tools and replacement parts on every service call. Call one if an E24 drain code persists after the filter and drain hose are clear, if water pools under the unit from an AquaStop or sump fault, if an E09 heating fault appears (the flow-through heater is built into the pump), or if the spray arms wobble on worn bearing rings.

Need Professional Help?#

• dishwasher repair service
• bosch appliance repair
• dishwasher repair cost guide

Not sure you want to DIY this? Book a diagnostic and we'll confirm the fix before any work starts.