I only do this for the vents where the air blows out.
Vacuum air conditioner vents.
Then go to the thermostat and turn on the fan only and let the vacuum run for a few minutes.
After you ve sprayed all of your vents start your car s engine.
Consider renting a heavy duty vacuum for this.
When done put a fresh filter in.
Start the engine and set the air conditioner to max.
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Then stick the flexible tubing of your vacuum cleaner down a bit into the vent and turn on the vacuum.
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Set both the air conditioner and fan blower to max.
Unscrew air conditioner vent grilles and give them a good thorough cleaning using warm soapy water and a soft bristled brush.
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Turn off the power connected to the heating and air conditioning system.
Unscrew the air duct covers or grilles from the walls.
Use your brush to clean the grates thoroughly.
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If they re very dusty and grimy you may want to use soap and water to make them gleam.
Vacuum the ducts as much as possible.
Let the grilles dry completely.