Clean Microwave vent?

I had an olive oil fire on my stove last week and had the vent fan on when it took place. It's a closed loop and just cycles through a filter. Long story short, the burnt oil fumes are embedded into every circuit board, wire, and component of my microwave. Changing the filter hasn't helped. Is there something like a chimney sweeping log for microwave vents (boil something on the stove to send cleaning fumes through), or do I just need to buy a new microwave to get rid of the smell?