Originally Posted by port_plz
Yep, razor blades work best but you do need to keep scraping until it doesn't feel rough as you pass over it.
I tried everything from steel wool, CLR, bartenders best friend, toothpaste and even hydrochloric acid! Razors are the only thing that made an impact.
If the minerals have etched the glass don't expect it to ever look crystal clear again. I managed to get mine in presentable condition but compared to my newer vivariums it looks a bit hazy and cloudy.
All that work and in the end I wish that I would have just bought a new one...
I did eventually decide to just buy a new one for this project. Figured it wasn't worth the headache! But now that the pressure's off, I will try the razor blade on the old tank. Should I use it dry, or toss some vinegar or something on there while I scrape?