White Vinegar wil dissolve the mineral build up, and if that does
not work use the CLR product commonly sold in most grocery or big box
stores....Vinegar will clean what needs to be cleaned and dissolve
99% of everything trhat needs to be removed......So will lemon juice.

Lemnon juice is dirt cheap (real lemon in imitation plastic squeeze
lemon less than a buck or a quart of white vinegar about 75 cents
works just as good as CLR which is $3


On 22 May 2006 13:29:56 -0700, "Dave W." wrote:
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.