“The essential oil tray slot leaves black residue on the essential pad, how to fix this?”
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Thank you for your inquiry. The black residue is what is left over of the essential oil. You will need to clean out the tray after each use, and once the residue builds up on the pad, it will need to be changed out. If you have any other questions please do not hesitate to contact our consumer relations team by emailing us at SocialSupport@helenoftroy.com. Thank you.
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