5 Yellow Peppermint & Eucalyptus or White Eucalyptus Blend Sinus Kicker Menthol Steamers are for the shower only. Note yellow will not stain shower because they are water soluble /skin safe color. Loaded with sinus-clearing ingredients like menthol and eucalyptus, they dissolve in running water and infuse the air with soothing aromatherapy. All you have to do is stand back and let the shower steam work its magic. Keep away from direct water flow to make them last for more than 1 shower.