Turn off the air conditioner and shut off power at the breaker
Locate the drain line and drain pan
Remove the access cap or cleanout port if present
Use a wet/dry vacuum on the drain line outlet to remove debris
Flush the line with warm water
Pour a mixture of distilled vinegar and water through the line
Use a flexible pipe brush or drain brush to clear buildup if needed
Check the drain pan for dirt, algae, or standing water
Clean the drain pan with soap and water
Reinstall the access cap or cleanout port
Restore power and test the system for proper drainage
Repeat cleaning regularly to prevent clogs