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