I though of goo gone. I'm sitting here looking at the bottle, and then the tank. I'm scared lol. The tank isnt "new" but its new to me and i dont want to mess it up.
I guess i can test it on the bottom to see if it would make the acrylic hazy.
I called a local LFS
and the girl told me to use Avons "Skin So soft" lotion. I LMAO when she told me that but, she swore it worked and she said she uses it in the store all the time to clean that kind of stuff off the tanks. lol