The Medway Handyman wrote:
Gary wrote:

The nest of plastic piping under our kitchen sink has developed an as
yet small leak. It's a combination of the main sink drain, half sink
drain and dishwasher drain.

What's the best way I can tell which of the many joints is leaking?
There's only dampness around the fittings at the moment so I can't
actually see anything dripping from anywhere.


Dry everything with kitchen paper & use a very bright LED torch - the light
makes water droplets sparkle & they are easy to spot.



Once the pipes have been dried off as above, tie strips of kitchen paper
near each joint and see which ones get wet. This will locate the slowest
of leaks even if is so slow that the paper dries but telltale stains
will show.

Bob