We have two identical basins in upstairs and downstairs bathrooms.
The plugs are push fit - rubbber grommet provides friction to hold centre mushroom up to keep plug hole open.
The one upstairs is very stiff but works as intended. The one downstairs seems to have traces of a lubricant, and you can watch the plug slide gently down to close of the plughole.
I have my suspicions that the builders put a bit of silicone grease (as used for lubricating push fit pipes) onto the stem of the plug because they thought it was too tight.
So how to clean it off?
Google has so far suggested that it is very difficult but that chloroform should work(!).
Any experience of cleaning this stuff off?
TIA
Dave R