The trick with vinegar is that it must be in contact with the deposit
for a significant length of time, unlike CLR or Lime Away, which work
very quickly. For example, when using white vinegar to unclog a shower
head or spigot, it often must sit in contact with the fixture for about
24 hours and sometimes needs a repeat after the first round. One way
to do this is to use a rubber band to fasten a plastic baggie of
vinegar to the fixture, so that the head will remain submersed.
Because it takes awhile to work, it doesn't work well for anyplace that
you want to simply wipe clean.

Jo Ann