"Dave W." wrote in message
oups.com...
Hi friends. A friend of mine recently gave me a 29 gal. tank that it
2-3 years old and seems to be in good shape, although there is some of
(what appears to be) mineral buildup in areas of the glass that
scrubbing doesn't seem to remove. Does anybody have a recommendation
as to the best thing to use to remove it? It probably isn't all that
noticeable under water, but it bugs me and I want to start with an
absolutely clean tank.

White vinegar heated up a bit in the microwave should
do the trick. It might take several applications and
some scrubbing but it's easy to rinse out - multiple
rinses with cold water, of course.
I'm assuming there are no fish in there yet...

Gail