"to unscrew the nuts to release the base from the floor. The water, condensation, and waste on the metal will cause it to weld together."
Thanks for the info, but the original question was about removing the tank bolts, not the bolts holding the bowl to the floor. Any advice you can give me about removing the corroded tank bolts is definitely welcome.
I'm not much of a muscle-man(woman!), so I'd like to find a way that doesn't take brute strength if at all possible. :) I'd pay someone to do it for me, but I'm unemployed at the moment.