On Thursday, 18 February 2021 at 21:43:34 UTC, newshound wrote:
On 18/02/2021 05:31, Geoff L wrote:
Remove as much water as you can pour in half a bottle of cooking oil it
will turn into a very caustic soap soft enough to wash down the drain
will take 1 to 2 days to work I had the same problem trying to clean up
a glass rolling pin

A neat idea, but how quickly does it work on a solid caustic blockage?
Would half a bottle be enough?

Time helps - maybe about nine years is long enough?