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I tried the Tecnu stuff several years ago. Unless they've improved it since I last tried it, it did absolutely nothing for me. Zanfil was the answer (it is also a scrub). I swear by the stuff.

I've lived around poison ivy/oak for most of my life and had it on nearly yearly occasions. I think the folks here in Parker County like to use it for ground cover (not):)

The one product I've found that works without fail is Zanfil. You can find it over the counter at most drug stores. Its not cheap, but I've taken to always having a couple tubes around the house during the spring and summer months. The kids and I are almost always needing to use it. It makes having poison oak nearly a non-issue. It will absolutely control the itching if you follow the instructions. Its important to use the scrub for 30-60 seconds before washing it off.

There's really no way you can kill out the plants but you can control it. As others stated, birds always bring the seeds back into your yard. The plant is a tuber which means the root system is highly interconnected. You can have plants off your property that are interconnected with plants on your property 100 yards away. Unless you kill them all, you can't eradicate it! Use Round Up or Weed Be Gone marked specifically for Poison Oak or brushy plants. Regular weed spray will not touch poison oak. I typically treat my property a couple times in the spring and then again in the fall when the poison ivy leaves turn dark red and make the plants relatively easy to find. In this way, you can control the spread of the plants, but its a yearly battle.