Unscrew air conditioner vent grilles and give them a good thorough cleaning using warm soapy water and a soft bristled brush.
Vacuum air conditioner vents.
When done put a fresh filter in.
Turn off the power connected to the heating and air conditioning system.
Unscrew the air duct covers or grilles from the walls.
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Vacuum the ducts as much as possible.
Then stick the flexible tubing of your vacuum cleaner down a bit into the vent and turn on the vacuum.
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Let the grilles dry completely.
After about ten minutes turn your a c off open all the car doors and let the fan blow for another five minutes.
Consider renting a heavy duty vacuum for this.
Set both the air conditioner and fan blower to max.
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If they re very dusty and grimy you may want to use soap and water to make them gleam.
Use your brush to clean the grates thoroughly.
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.
That does a great job and you can do it with or without the brush.
Use a high powered vacuum my tool of choice is a shop vac to vacuum just inside the ducts removing any dust or debris.