One way to kill poison ivy and other undesirables, is to use “horticultural” grade vinegar.
Horticultural vinegar
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How to Spray
To spray the vinegar, I used a sprayer originally sold to apply cleaners, preservatives, and sealers on wood decks and siding.
Where to Buy
I placed an order through eBay for a 4-pack of 20% vinegar. That 20% concentration is hard to find! With UPS Ground shipping included, I paid a total of $71.71. Seems expensive to me. I see that the seller also has a store outside of eBay but I have not yet ordered from their website. The direct link to their website and vinegar: marshallgrain.com
20% vinegar is expensive and hard-to-find. This brand is "Nature's Guide".
Other Ideas
Because this stuff is expensive, it might be worth the effort to make your own vinegar.
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