For cold-air (waterless) diffusers:
Power off & unplug. Remove the fragrance bottle.
Rinse the lines: Add a small amount of isopropyl alcohol (70–99%) to the empty bottle, attach it, and run the diffuser on high for 5–10 minutes to flush the atomizer.
Discard alcohol, power off, and let parts air-dry.
Wipe the nozzle and exterior with a soft cloth; keep liquid away from electronics.
Reattach your fragrance bottle and resume normal use.
Maintenance cadence: clean every 2–4 weeks with daily use, and every time you switch scents. Store oils upright, away from heat and direct sunlight.