Unscrew the air duct covers or grilles from the walls.
Vacuum air conditioner vents.
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.
Then stick the flexible tubing of your vacuum cleaner down a bit into the vent and turn on the vacuum.
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That does a great job and you can do it with or without the brush.
Start the engine and set the air conditioner to max.
After about ten minutes turn your a c off open all the car doors and let the fan blow for another five minutes.
If they re very dusty and grimy you may want to use soap and water to make them gleam.
Set both the air conditioner and fan blower to max.
When done put a fresh filter in.
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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Use your brush to clean the grates thoroughly.
Dryer vent cleaner kit vacuum attachment and dryer vent brush.
After you ve sprayed all of your vents start your car s engine.
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Then go to the thermostat and turn on the fan only and let the vacuum run for a few minutes.
Vacuum the ducts as much as possible.
I only do this for the vents where the air blows out.