If you have had the rash for a while and it is not spreading, then you may have already removed the plant's rash causing oil, urushiol. After showering for many days, your soap may have finally removed any oils that are not bonded with your skin. The rash is your body's reaction to this bond. If your rash is spreading then you may want to use one of our cleansers.
The purpose of the Tecnu Original Cleanser is to remove urushiol, but it does not include any anti-itch medication. Again, if your rash is not spreading, this product won't do anything for you at this point.
Other products we make that will help with itching and oozing but do not contain a cleanser to remove rash causing oil are Tecnu Rash Relief Spray or Calagel - your preference here depends on whether you like a calamine-type anti-itch medication (Calagel) or a homeopathic anti-itch remedy (Tecnu Rash Relief Spray). If you have had some success with tea tree and your rash is not spreading, I would recommend trying Tecnu Rash Relief Spray.