Yellow marks appearing on a white synthetic garment, usually acrylic caused by exposure to sunlight and not staining as such.
This problem is not caused by your washing machine and no service or repair will resolve this problem, only care of the garments will prevent the issue.
Damage is irreversible
Cause & Prevention
Acrylic fabrics when exposed to prolonged light or heat sources can turn yellow, due to damage of the fibres.
Do not expose synthetic garments to prolonged sunlight or heat.
How You Can Get Help With Laundry Problems
To offer support in helping people to determine the cause of laundry problems please use the washing machine 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 technicians to see what the problem is.