I only do this for the vents where the air blows out.
Vacuum air conditioner vents.
Then stick the flexible tubing of your vacuum cleaner down a bit into the vent and turn on the vacuum.
Unscrew the air duct covers or grilles from the walls.
Then go to the thermostat and turn on the fan only and let the vacuum run for a few minutes.
Set both the air conditioner and fan blower to max.
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Use a high powered vacuum my tool of choice is a shop vac to vacuum just inside the ducts removing any dust or debris.
Let the grilles dry completely.
Vacuum the ducts as much as possible.
After you ve sprayed all of your vents start your car s engine.
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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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This dryer lint brush vent trap cleaner tool makes cleaning your lint trap and dryer vent a breeze.
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If they re very dusty and grimy you may want to use soap and water to make them gleam.
Start the engine and set the air conditioner to max.
Turn off the power connected to the heating and air conditioning system.
That does a great job and you can do it with or without the brush.
Dryer vent cleaner kit vacuum attachment and dryer vent brush.
Consider renting a heavy duty vacuum for this.
After about ten minutes turn your a c off open all the car doors and let the fan blow for another five minutes.