Hey Larry...what do you think would happen if you just sprayed the tilex diectly on the poison oak/ivy?
On a side note...Sorry this is so long...but it kinda fits...we had this huge spider at our front door... better known as a camel spider, false scorpion, etc.
These things can RUN as fast as 15mph...and the larger ones like the one above our front door have been known to eat small birds

Anyways...this thing scared the $hit out of me...so I ran to the garage to get the insecticide...I sprayed the spider with it and it dropped like a rock.
Because I have a curious nature (And didn't know what the heck I had just killed) I took a picture of it and sent it to the ASU science department...they identified it and told me what it was...and NOT to kill it (Damn) as they eat REAL scorpions also...The professor asked me if it was still alive and when I told him that I killed it...he asked me how...as they are pretty impervious to insecticides...he wanted the name of the bug killer I used. I ran to the garage while he was on the phone...and to my surprise...I had grabbed the weed killer spray by accident
I guess it works on camel spiders, too!
Here's what one looks like...yuk