Hello there im hoping for some information as im completely clueless on this subject, my neighbour installed a boiler in the spare room of thier house and without asking ran an external gas pipe down the front of my property and the condensate pipe into my gutter pipe. About 3 months later i got new gutters and rough cast and the guys doing the work cut his condensate pipe from the gutter, i told my neighbour it was up to him to sort this out but now 6 months later the condensate pipe is leaking onto his gas pipe that runs down my property, im aware that the waste is acidic but how dangerous can this be as neighbour has clearly no intention of re routing the pipe, thanks.