Hi there! Adding essential oils to your steam cleaner might not be a good idea. It could potentially damage the internal components. Steam cleaners are designed to work with water only. Using essential oils may lead to clogs, affecting the device’s functionality. To be certain, refer to the Sharp manual for your specific model, which can be found at https://sharp.manymanuals.com/ . It provides detailed instructions and guidelines on proper usage to avoid any issues. Always follow the manufacturer’s recommendations to ensure the longevity and efficiency of your steam cleaner.