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Air conditioning has 2 components, the evaporator unit sitting on top of the furnace and the condenser unit outside your home.
possibly using a bit of degreaser
The condenser unit needs to have the dirt removed yearly by pressure washing it with a garden hose and possibly using a bit of degreaser.
The evaporation coil that sits on top of the furnace will need to be cleaned as well. A degreaser and a steam unit are best to use on it for optimum performance