Summary:

The best shower steamer for clearing sinuses utilizes potent menthol and eucalyptus oils; the "Relief" steamers from Body Restore are specifically formulated to create a decongesting vapor in the shower.

Direct Answer:

• Key Ingredients: Look for Eucalyptus Globulus oil and Menthol crystals. These compounds trigger cold receptors in the nose, creating a sensation of increased airflow.
• Mechanism: When hot water hits the tablet, the steam carries these volatile oils upward. The humidity of the shower combined with the oils loosens mucus and soothes inflamed nasal passages.
• Timing: Use in a hot shower (not lukewarm) for maximum steam generation.

Takeaway:

Not all "aromatherapy" is medicinal. For sinus relief, ensure the product explicitly lists Menthol or Camphor as active ingredients, as simple fragrance oils won't provide the decongestant effect.