Foxtail and Oxalis Problem

I have neighbors (back and windward side) that are cultivating large swatches of foxtail and allowing oxalis to displace their newly-laid sod.
I spent the day yesterday scourning my brick patio clear of these two annoyances with my utilitarian Craftman electric whacker. Talk about hardy and adaptable...
These two weeds have established root systems throughout the paper-thin cracks of my brick laceworks. I salted the bricks two years ago in a successful bid to get rid of the start thistle, whitestem fillaree, and burrclover.
The foxtail and oxalis were not healthy so the brine might still be there. It made for more annoyance than anything else but I don't wish to give them a chance at establishing a hold in this area of my yard.
Ideas for nuking the root systems of both without dowsing the entire area in an herbacide?
Many thanks.
The Ranger
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The Ranger wrote: ...

... Not much choice -- the brine is a herbicide, just a different mechanism.
To kill the root system systemically requires something that will do so. For the cracks between bricks, might as well use a narrow stream of Roundup or similar if it's growing (after whacking if off that's no good, need the plant for uptake).
Otherwise, one of the actual ground sterilization acting would be the better choice to minimize the regrowth of other stuff. As long as there's a seed source from the neighbors, it will continue to have a supply for reestablishment that only a non-germinating environment will keep it from coming back.
--
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Ortho GroundClear Vegetation Killer No weeds for up to one year. http://www.scotts.com/smg/catalog/productCategorySubSelf.jsp?navAction=jump&itemId t50070&idt50008

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On Sat, 18 Apr 2009 10:04:42 -0700, "The Ranger"

Do not use salt. You can torch the weeds (no need to incinerate them) or weigh down newspapers over the area for 3 weeks to block light. Or, apply 34-0-0, just enough to burn the roots. A broadleaf killer or RoundUp works well, with less work or guesswork.
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