Applying cold compresses several minutes each hour, applying a mixture of baking soda and water, or pouring cold, black coffee on the rash are good natural treatments for poison ivy, according to HowStuffWorks. Rinsing the rash with vinegar or immediately washing with water and soap are also possible home remedies.
A person should apply new baking soda paste every two hours three times a day and bathe in lukewarm water mixed with a cup of baking soda to treat poison ivy, recommends HowStuffWorks. Using vinegar as a remedy involves cleaning the affected region with lukewarm water and soap, rinsing, and dabbing a cotton ball soaked in vinegar onto the rash. Another possible remedy is to apply the sap of aloe vera, which contains anti-inflammatory components.