Pick up a bottle of this by the dishwasher detergent and dish soap. It has a wax seal in the top because it's meant to melt out in the dishwasher. I use this to soak my water valves for my rat tubs. It's safe for plastics and rubber gaskets and is not harsh like lyme away. Works better too I think.
Lay the tank on it's side out side or in the tub. You'll be doing one side at a time. Use something to make a good hole in the wax seal and squirt enough out to put a very thin layer over the glass. Let it sit for about 10-15 minutes. Test a section with a sponge or rag and the Lyme should come right off. If not, squirt a bit more on and wait a little longer.
It will depend on how thick the Lyme is and how long it's been there. If the tank is huge and you need to use a lot, mix it 1/4 hot water to dishwasher magic to coat the glass.
Once one side is done, turn the tank over and do the other side. This stuff will not eat away the caulk sealant so it is completely safe to let it sit on it like this. It will not scratch or pit the glass. Lyme away does all this bad stuff. I learned this the hard way when I used Lyme away in my dishwasher one too many times and it destroyed a bearing in the motor and I had to buy a new one.
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