Hello everyone, I apologise if there was a thread regarding this topic. I am a first time renter and I have noticed weird residue on the pipes - could you please shed some light on the subject for me? Is it worrying? I have noticed that the pipes in that area we're wet a couple of month ago. I will report it to the landlord but he and the agency are usually very dismissive of everything and I want an honest opinion from you. Thank you for all your help.