After rescuing Catwoman from Boneblaster, a new villain trying to make a name for himself, Poison Ivy takes Catwoman back to The Riddler's townhouse. When there, Catwoman sees that Ivy has been keeping the Riddler under mind control so that she and Harley could use his townhouse as a hideout. Here, Catwoman decides that with Gotham City more dangerous than ever with all of the gang wars and a new Batman, a partnership with the other two women would be advantageous. However, Ivy fears that Catwoman has lost her edge and prowess, and consults with Zatanna on the nature of Catwoman's injuries. Zatanna responds that Catwoman has psychological wounds that would need healing. Ivy resolves that she and Harley would provide Catwoman with "positive female reinforcement". The three then agree to become a team. However, Harley and Ivy have one condition: they demand that Catwoman reveal to them the true identity of the original Batman. Boneblaster then suddenly breaks into the apartment and the three of them have to move after they defeat him.
"A wise old man told me that the water in a quench bucket (which is the bucket a blacksmith uses to cool iron rapidly by dunking the hot iron in it) was the best cure-all for poison ivy that he had ever used. When a friend came down with a bad case of poison ivy and told me that calamine lotion wasn't working, I shared the wise man's story. She promptly filled a plastic spray bottle with my dirty quench water and coated her arms and legs. A day later she returned to the shop wanting to sell the "magic elixir" to the public. The theory? Heavy concentrations of iron in the water accelerated the drying up of poison ivy blisters." 
Noni works for this one also. I get poison ivy pretty bad and used to take shots for it. Now when I break out in a rash I take my all natural noni juice, shake the bottle real good, then pour some onto the rash. It does not get rid of the poison ivy but it will take away the itching for 12 hours straight! I had poison ivy on my foot and blisters between my toes. I shook the noni, rubbed it on the rash put my socks and shoes on and went to work. I never itched until almost bedtime that night. I did this for seven days until the rash cleared up.