How to remove wasp paper from soffit vents and siding
We won't read about your house burning down as a result of using fire, will we? It was my first instinct to suggest fire as an answer, but it's really not a good one. A pressure washer would not be advised, due to water getting in the worst place, insulation!

That leaves high pressure air, from a compressor, as a possible solution. It's certainly less damaging than a pressure washer and will not cause insulation problems either. Combine a stiff brush with the high pressure air flow and you'll have a decent result.