My fridge is a small compressor fridge, but the Dust build up on condenser and condenser fan blades is an issue.
I mitigated it by installing an air filter on the intake vent. This white filter, designed for use behind vents in stick and brick homes, turns brown quickly.
The dust which accumulates on the fan blades now is made of much smaller particles and takes much longer to build up to the point it reduces airflow.
But I still remove the fridge every once and a while and run some bristles over condenser fins with some compressed air assist and use qtips and rubbing alcohol to remove the dust build up on the fan impeller leading edges