Car Diffuser- Blue CitrusBlue Citrus scent features an explosive blend of all things citrus. It brings together the natural sweetness of grapefruit, the brilliant zest of orange, and a pop of lemon to create a bright and refreshing aroma. To use, all you have to do is take out the little plastic stopper, soak the lid for a couple of seconds, replace the stopper, & enjoy! Repeat when the scent gets faint.