White garments turning green from washing machine
It is a strange phenomonem to see green marks on white garments, especially if you have not let these items come into contact with any other colours during a wash.
This has nothing to do with your machine so you will not need to call out an engineer.
Cause and Prevention
The cause of this marking is the detergent itself. This is because modern detergents contain photobleaches, designed to give extra cleaning, even after washing, especially when the garment is exposed to sunlight. Unfortunately, in a very small number of cases, this may result in the green tinge on your white garments.
Some people believe that to get their whites really clean is to add extra detergent to the wash. However, this is counter-productive and may be the cause of the green marks on the garments. Always ensure you use the correct doseage of detergent.
If you have heavily soiled garments, it is best to use the pre-wash cycle on your machine instead of adding extra detergent,
How to get rid of the marks
Soak the affected garments overnight in a mild soapy solution, made up from a flaked bar of gentle soap. You should then rewash the items in the correct washing cycle, having checked the garments for the correct temperature wash.
Hanging the garments on the line on a bright sunny day may also remove the marks.