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Sure this would have worked but is really overkill!

Just spray the area thoroughly then walk away and let the chemical do it's work for 4-6 months.
Then visit the area every 6 months to nuke any...

I do a lot of weed control work and often spray wandering jew.

Roundup or glyphosate does not kill it.
Tordon Brushkiller will kill it but leaves significant picloram residue in the soil....