My tank has

[caveman0777]

My tank has calcium stains that just wont go away... How can I get rid of all the white cloudy stains in the glass? I tried glass cleaner, vingar and water... Bleach... And nothing wotks

 

[vanimal]

That happened to my tank try a razor blade. It still didn't work for me but it might for you.

 

[christine2012]

Razor blade, vinegar, and lots of elbow grease! Works everytime

 

[Alyxx]

Razor blade, vinegar, and lots of elbow grease! Works everytime

This! If the tank is empty, hang some paper towels soaked in vinegar so that they're touching the glass, and leave them there for an hour or so, then start scraping with a razor blade.