Q: Can pouring boiling water down the drain cause a clog? A: Yes, pouring boiling water down the drain can cause grease and oil to congeal and solidify, leading to clogs and blockages in the pipes.
You haven't cleaned the pipe; you have just relocated the problem. Plumbers call these "fatbergs"—massive, solidified blobs of grease that block municipal lines. They almost always start with someone pouring hot water and grease down the sink.
