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Black streaks and marks on white washing


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I keep getting black streaks and marks on white washing from my Bosch washing machine / tumble dryer. I have has a service engineer come out and he could not find the reason replaced the door seal. First was after this and it happened again on a pair of cream denim trousers. The machine is 1 year old.  and this started about 6 months ago. Has anyone else had this happen 

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On 27/11/2021 at 22:36, Longman S said:

black streaks and marks on white washing from my Bosch washing machine / tumble dryer

Hello Susan. Do you mean it is a washer-dryer or that you aren't sure if it is the washing machine or the tumble dryer? I'm presuming it is a washer dryer?

Can you tell me what wash cycle you use most and its temperature? And do you use liquid detergent?

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Hi. Using mostly 30 degree washes and liquid detergent can cause a big build up of grease, grime and even black mould inside washing machine. 

Was the door seal that got replaced covered in gunge? Also have a look under the door seal under the lip of the revolving drum to see if there is any nasty stuff. 

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Tbh it does normally take a few years to get bad. If washing machine is nice and clean it’s hard to imagine where black marks could come from. 
 

Washer-dryers have a vent at the top of the door seal where the hot air for drying is blown into the drum. It’s very common for laundry to get caught on it especially if overloaded. Try rubbing a light cloth around up there to see if you can find anything. 
 

Other than that I can only point you to my article washing not getting clean or has marks on it in case it has anything useful. 

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If you could post any photos it might help too. 

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Try getting an old light coloured sheet or cloth and see if you can replicate the marks by dragging it firmly around the door seal where it meets the lip of the drum and up at the top where the vent for the dryer is. 
 

Essentially, as the laundry is inside a steel drum and the marks are long it can only really be caused by laundry getting trapped and dragged around the door seal. 
 

It seems to be common in washer-dryers though manufacturers usually blame overloading. 

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Warning:  Read this before attempting any diy repairsNo representations or warranties are made (express or implied) as to the reliability, accuracy or completeness of advice. I can't be held liable for any loss arising directly or indirectly from the use of, or any action taken in reliance on, any information on this website, which is given free of charge and in good faith.

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