I'm a huge fan of white vinegar to clean tanks. It cleans like crazy and leaves no residue, just make sure to rinse well. If there is any left behind for some reason, it won't harm your fish.
Usually if I clean with vinegar, I don't let it dry out naturally, I just wipe it dry and call it good. I've never had a problem with anything popping up.
I know some other people use regular bleach (not scented) to clean. Again, just remember to rinse well and with bleach add an extra dose of dechlorinator to make sure there is nothing left.
Just make sure nothing you use has other cleaning agents or other chemicals added.
Also, I you didn't mention if the tank had been used recently or not. I'd suggest doing a 24 hour leak test to make sure it holds water fine. Sometimes old silicone will dry out and when it resaturates it doesn't form a complete seal. If this happens, it is pretty easy to reseal a tank though, most fish places sell aquarium sealant.
Last edited by Gryphon; 11-28-2012 at 03:03 PM.
Reason: I can't spell. :-)