Any question answered...

I have a bike I rescued from a skip. It's battered but I <3 it and won't give up on it. The previous owner seems to have kept it submerged in their garden pond so all the components are pretty fucked, though the frame seems sound which is the only reason I am still pursuing this.

I want to remove the bottom bracket as it makes a hideous graunching sound. However, I can't get the drive side crank bolt off. I have:

1. poured hammerite rust remover into the well of the crank around the bolt which has removed the surface rust
   
2. sprayed it liberally on both sides with plus gas several times which has produced a few mm of movement and a soul-crushing headache
   
3. Attempted to use an 18" breaker bar to obtain Moar Leverage which doesn't really do much as the crank on the opposite side laughs at my feeble attempts to stand on it to steady it while I try to move the bolt
   
   

The bolt remains stuck. What genius idea should I try next?

Got any lengths of scaffolding pole lying around? Very handy stuff. If the pedal's off the crank you can slip the scaff pole over the crank to use as a cheater bar and give you more leverage.