How to safely get really bad calcium build up off a tank?

[BuffaloPolypteridae]

Whilst in the hospital my buddy watched my big fish. The tank was broken down but now I have horrid build up to deal with on my 55. I could just get a fresh tank but what would be best to clean it with? Worst case I could use it with a reptile

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[xraycer]

Try vinegar and a razor

 

[that_fish_Guy]

Try vinegar and a razor

+1 another thing would be to soak a cloth or towel in the vinegar and drape it over the area with the buildup(I'm assuming the rim of the tank ) let it sit there and then it should soften it up enough to be able scrape off

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[monkeybike]

Muriatic acid is the best, get some rubber gloves and sponge it on straight on, rinse rinse rinse. You won't even have to scrape. Do it outside, the fumes will f you up without some fresh air. We used to do it that way all the time at the store. Makes them look like brand new.

 

[tommyfc3s]

vinegar in a spray bottle, liberally mist the whole area you plan to clean with it, let sit for while then hit it with a razor and scrubby sponge