How to clean internal airflow duct?

I need to clean the internal airflow duct on my Ambex YM-15 and am having trouble finding the right tool for the job.  Ambex recommends a small chimney sweeper.  I've contacted a couple of chimney-sweep tool companies and neither can recommend an appropriate brush or rod or point me in the right direction.  I live in Florida so I can't just go the the hardware store and find the right tool as they aren't carried locally.  Anyone have any recommendations?  Thanks in advance for the help.

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