Hard water stains

[Kingdom Come Discus]

Hello,
I have five 40 gallon breeding tanks I purchased, used, from a friend of mine. The sides of the tanks are covered with hard water stains. I have tried scrubbing (for long periods of time), with brillo pads and vinegar and rubbing alcohol. These attempts have not removed any of the stains. I have kept discus in these since this, but I have sold some fish and would like to remove the stains before I introduce more fish.

Any advice would be welcome,
Thanks Kraig Koontz

[Greg Richardson]

Get them wet then try a razor blade.

[Kingdom Come Discus]

Thanks Greg. I will let you know if it worked.

[Tropical Haven]

It will work for you, thats what I use to do and worked like a champ.

[CliffsDiscus]

Use Lime-A-Way cleaner or Lime Off by Jungle

Cliff

[DDC]

I would have thought that the razor blade would work well.