R+Co Oblivion Clarifying Shampoo Ingredients like witch hazel and tea-tree oil are the stars of the R+Co Oblivion Clarifying Shampoo ($27), which work together to purify both the hair and the scalp and get rid of unwanted product buildup. Image Source: amazon.com R+Co Oblivion Clarifying Shampoo $27 from amazon.com Buy Now