Empty Remaining Oil: Carefully pour out any leftover oil from the diffuser bottle. Fill with Isopropyl Alcohol: Add high-concentration isopropyl alcohol, ideally between 91% to 95%, to the bottle. This concentration is effective for dissolving stubborn oil residues. Run the Diffuser: Set your diffuser to a high-intensity setting and let it operate for about 30 minutes. The alcohol will help to cleanse and sanitize the interior components. Empty the Alcohol: After 30 minutes, turn off the diffuser and safely dispose of the isopropyl alcohol. Drying: Allow the bottle and diffuser components to air dry completely. It's crucial to ensure no alcohol residue remains before the next use. Refill and Use: Once everything is dry, you can refill the diffuser with your preferred oil and use it as usual. This cleaning method is a good practice to maintain your diffuser, especially if you frequently change oils or notice a decrease in performance.