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Prairie Naturals: Big Sky Tea Tree Medicinal Shampoo. Big Sky: Deep Cleansing for Oily Hair, Dandruff & Scalp Irritations Big Sky Tea Tree Medicinal Shampoo provides relief from irritation due to mild scalp disorders. Big Sky Tea Tree Medicinal Shampoo provides deep, gentle cleansing action with anti-septic relief from itching and dandruff. Herbal extracts and natural plant emollients leave hair shiny and manageable. Tea Tree Oil is a non-toxic astringent, which acts as an effective disinfectant, bacteriastat and fungicide. Prairie Naturals Hair Care products are fragranced with pure, natural aromatic plant oils.