There was a question a couple or so weeks ago, about sink drains producing smells, which produced a few solutions. My sink is a type with a bowl plus a smaller bowl alongside it, both showing a common trap, then out through the wall in 42mm OD push fit, all of which I installed some 30 years ago. The smell comes and goes.
Yesterday evening, I made up a wooden bung, to block a short section of 42mm, hot melt glued into the 42mm - which I then used pushed into the elbow outside, to prevent the sink draining.
I then filled the sink with bleach and water and left it overnight to soak, until this morning, before draining it and rinsing. Looking down the plug holes before I began, it was obviously filthy down there, but when I had finished it was absolutely spotless and no sign of even the slightest smell.
It beats stripping it all down and the result was likely much cleaner.
Yesterday evening, I made up a wooden bung, to block a short section of 42mm, hot melt glued into the 42mm - which I then used pushed into the elbow outside, to prevent the sink draining.
I then filled the sink with bleach and water and left it overnight to soak, until this morning, before draining it and rinsing. Looking down the plug holes before I began, it was obviously filthy down there, but when I had finished it was absolutely spotless and no sign of even the slightest smell.
It beats stripping it all down and the result was likely much cleaner.