Natural Treatments For Poison Ivy...Natural Treatments for Poison Ivy Baking Soda A paste prepared by mixing baking soda and water can be applied on the rashes to reduce itching and irritation associated with the problem.Fresh banana peels can be rubbed on the rashes multiple times in a day to reduce the pain and itching caused by the problem. Application of a mixture of banana pulp and warm water can also help in the treatment of the problem. Watermelon