Harmless Chemicals

[Ludwig Venter]

How do I remove the hard white calcium water evaporation marks around the top inside half of most of my tanks..... this is also very apparent where my aeration bubbles sprays droplets against the glass on the inside corners..... To date been using "elbow grease", but very exhausting.

 

[Hawkins]

the elbow grease could get in the tank water and kill the fish, be careful!!

but seriously, i had this problem on the OUTSIDE of my tank, some water marks/stains.
i used wire wool

dont try this on acrylic

 

[helterskelter]

Best way is to use a razor blade.

Vinegar and lemon juice works as well.