It has been suggested by someone who *knows*, that vinegar is a good
medium for clearing out persistant residue in a narrowboat toilet holding tank.

Apparently you leave it in to soak for about 24 hours before
thoroughly flushing.

Has anyone any practical experience with this?

It has been suggested that it wouldn't be a good idea in plastic tanks
as vinegar might harden the seams. Do we have any feed-back before we
try it?

Tony
holding back on the Basingstoke Canal