Solved
Bosch

Black Mark on Bosch Washing Machine inside seal

NINick in NZ
Asked over 3 years ago 5,808 views
0

Our Bosch washing machine is only 8 months old, and this morning I went to do a wash and noticed on the seal on the inside, there was a black mark / stain

I gave it a rub with a wet soapy cloth but it wouldn't come off at all (see photos)

our last washing machine (also Bosch) had the same issue, but that machine was about 14-15 years old when it died.... our one is only 8 months old

does anyone know what this mark is, what causes it, and how to get rid of it?

any help would be appreciated

Thank you

Solution Summary

AI-generated from this discussion

This thread was marked as solved. Here's a summary of the problem and the fix, generated from the discussion below.

Black mark on Bosch washing machine door seal likely mould

The problem
A Bosch washing machine, around 8 months old, developed a black mark or stain on the inner door seal that did not wipe off with a wet soapy cloth.
Likely cause
The accepted reply suggested the mark was likely black mould on the door seal. No further diagnosis or confirmation was provided.
What fixed it
The forum advice was preventive rather than a confirmed repair: wipe the door seal and its grooves with an old cloth after each wash to remove remaining water, and leave the door slightly open to let the seal dry. The exact method to remove the existing mark was not confirmed.
Checks to try
  • Black mark on the inner door seal would not come off with a wet soapy cloth
Parts or tools mentioned
  • wet soapy cloth
  • old cloth
Cause identifiedGenerated 14 Aug 2026 · AI summaries can make mistakes — read the full thread below.
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2 Answers

Accepted Answer
0
WH
WhitegoodshelpVerified Engineer
Answered over 3 years ago

Hi. Is it black mould?

what causes black mould on washing machine door seal

Whitegoods Help — appliance repair expert and forum host.
0
TA
Taylor Rose⁰
Answered about 3 years ago

Each time you do a wash make sure to rub the seal around the door with an old cloth and run the cloth in the grooves within the seal to get rid of remaining water left from the cycle. Also leave the machine door open an inch or two to allow air to dry it out, prevents smells from developing too within the machine.. This might help.

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