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.
Banvine or Woody Weedkiller may do OK but again is pretty nasty and expensive.
Escort or metsulfuron may work but also leaves residue in the soil.
Versatill won't touch it.
By far the best choice is Grazon at 6 mils per litre + Boost or Pulse penetrant at 1 mil per litre. Will not kill grass. You can buy a 1 litre bottle at any farmshop or get a bit from a friendly farmer.
A follow-up spray will be needed 6-12 months after the first hit, to clean up the bits that escaped.
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