The snot rocket suggestion is not as bawdy as it sounds, It is used regularly in competitive cycling, as is the sweat shower. The latter requires some speed and obviously some sweat (which is plentiful on a 30 minute climb). Sit up slightly and get your head in the airstream. Then press on your helmet to sponge out that sweat reserve in the brow padding and voila - instant retreat.
A more gentlemanly technique is to push him in the gutter. Not physically of course, but tactically. You assess the wind and wait until it comes over your right shoulder. That means the wheelsucker's sweet spot is on your left, just behind you. Then you move over left until you are on the edge of the road. His sweet spot is now somewhere off the road, hopefully on the gravel or mud. If the wind comes over your left shoulder, you simply push him into the oncoming traffic by moving over as far right as you can go.
A final trick in my arsenal is so pedal like a rookie. This technique calls for you standing up to pedal when you reach a hill and in the process you kinda miss a beat and go backwards a little bit.
There is more than one way to skin a cat.