How to remove a trunnion which is stuck in a Frigidaire washer?

I am trying to fix the leak problem from the tub seal of my frigidaire washer. Using resources availble in internet, I was able to remove the inner tub. It took a whole day to remove the inner tub even after removing the 5 bolts holding it due to the buildups. After removing two bolts and a metal plate, I was trying to remove the trunnion to access the tub seals. Unfortunately, it is not comming off. I tried WD-40, hammering, twisting and everything I can think of. This is quite an old washer which has some stuffs (like detergent) turned to a cement. I am wondering why professional guys would do this: trunnion removal. Are there any better chemical than WD-40? Please help me on this. I am very desparate. Thanks.