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Plastic items turning yellow or brown in a dishwasher


Plastic items become discoloured and exhibit a yellow or brown appearance often blamed on a dishwasher not cleaning properly.

This is not a problem that is a result of a fault with your dishwasher

Please see the notes below on how to avoid this problem.

Usually the result of:

  • Age of the plastic
  • Plastic items that are not dishwasher safe
  • Iron in the water supply to the dishwasher

Cause & Prevention


Many plastic items will go yellow/brown with age or a continual exposure to heat.

Yellow/brown discolouration can also be caused by the presence of iron in the water supply.


There is no treatment to reverse the damage.


Only use plastic items that are clearly dishwasher safe.

Investigate the water quality with your local water authority.



  How You Can Get Help With Dishwasher Problems

To offer support in helping people to determine the cause of dishwasher problems please use the dishwasher support forum.

It’s fast, free, easy and normally someone will pick up on the post that can assist you often with a few experts chipping in if needed. Just register if you don’t have an account, we don’t mail you, send you spam or any of that stuff.

Post up your question and give images if you possibly can and the guys in the forums will do the rest for you and try to identify the problem you have.

Cost you nothing, might save you some embarrassment or worse, a charge for a service visit that wasn’t needed.

  Photographs Of Damage

If you can post photographs of the damage or problem you are having this can be really helpful in allowing the dishwasher technicians to see what the problem is.

The guys have the knowledge to assist with most problems but the more information you give them, the better they can help you.

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