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Also, RINSE THOUROGHLY... once you think you have rinsed it enough, rinse it out 3 more times- residual bleach and vinegar will KILL any fish you put in there... so make sure its super clean
I first go over the tank with a straight razor blade to get off any caked on stuff. After that I use straight vinegar and a new clean rag to kill any bacteria/mold. After I rinse with water really really really well. That should do it. If anything remains try the razor blade again.