03-06-2012, 01:08 PM
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IMO you can use anything as long as it doesn't harm the glass or seals. Just make sure you rinse, rinse, rinse, rinse, and rinse a few more times......
I use vinegar if its not bad, I use straight vinegar and a sponge. If a tank has major hard water build up then I break out the CLR. You can lay the tank on its side and get 1" or so of standing water in it then add CLR and let it sit like that. Repeat for each side.
Main thing is to know what your cleaners active ingredient is. CLR is a bunch of acids, vinegar is more diluted acids. Rinsing is enough to get rid of either one and not have to worry about residues.