Dawn dish soap Home › Forums › Archives › Old Bulletin Board Archives › Dawn dish soap This topic has 0 replies, 1 voice, and was last updated 25 years, 1 month ago by LHart8519. Viewing 0 reply threads Author Posts 21 Sep 1999 at 10:08 am #283755 LHart8519 I was told by a plumber that Dawn dishsoap causes pipes to clog with grease/fat. Is this true? Does anyone else have this experience? Author Posts Viewing 0 reply threads The forum ‘Old Bulletin Board Archives’ is closed to new topics and replies.