I would definately use a rust penetrant as the soaking agent then add some lubricant as it works free. I use BG's In-Force as a penetrant but it's commercial grade stuff so finding it may be difficult. Go to dealerships and independent shops, they may sell you some,
Scott
Oh, Chevman, I see you're from my neck-of-the-woods. If you ever come to Cedar Rapids, I'll give you a can.