miriam,
DH said to tell you that if you get some Jewel Weed also known as touch me not is good for the ivy. It will clear it right up. But, don't know if you have it growing in your area. It grows in a low lying moist area. If you have the jewel weed in your location break the stem and put the jelly substance on the poision oak or ivy and it will go away.
We have it in WV.