Black lines in washing

[ZolaBudd]

Can anyone help? I’ve done the 90° wash. I’ve done the washing machine cleaner cycle thing. And I’m still getting these.

Couple of possible reasons:

https://home.howstuffworks.com/home-improvement/household-hints-tips/cleaning-organizing/washing-machine-leaves-stains.htm

https://www.mumsnet.com/talk/housekeeping/2979489-Washing-machine-leaving-immoveable-black-marks-on-laundry

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