Reluctant bumper

Probably like many others, the two big bolts holding my rear bumper show every sign of being seized - very rusty-looking, and there are creaking noises if I apply a decent amount of torque but no signs of movement. I want it off so I can tackle some rusty corners on the rear wings, but it's looking like a pain of a job.

Anyone found a way of undoing them that doesn't destroy the bumper? Or the crash cans for that matter? I can see me trying to grind the heads off the bolts! If I can get in there with the penetrating fluid I'll see if that works, but I feel that that's unlikely.

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