Black marks appearing on shower screen
Very helpful member
Please see the attached images.
Does anyone know what is causing these black marks to appear on the white lines of a glass shower screen? They only appear on the white detail of the shower screen.
My customer has asked me what is causing it and my immediate response was mould, of some type, and my solution was to apply bleach. This did in fact remove the marks, however, they come back every few days or week at most!
The customer does not actually use this shower. It is located in a downstairs toilet which has the usual setup of a sink, bidet and toilet as well as the single cubicle shower. It is also worth noting that this problem has only started happening about 3 months ago and the marks were not there for the 3 years prior to that! As the shower is not used, no products have previously been used to clean the shower glass.
Ideally, I am looking to understand what is causing the problem so we can resolve for her once and for all. Prevention would be better than cure!
Thank you in advance for any suggestions