Something like a pressure washer drain cleaning end, but with
compressed air instead of water?

Radio-controlled model helicopter with brushes on the rotor end, and
CCTV camera so you can see where it's going?

Long-haired cat, hairspray it so the fur forms bristles.?

Bass guitar amp in the fireplace pointing upward, and vibrate the soot
off.

The Natural Philosopher wrote:
That's a neat one. Never thought of that.

How about the idea of just chucking down half a dozen hedgehogs then?
:-)

Eddy.