[sargun]

So, you’re essentially washing the soil in DMSO, and DDT is more soluble in DMSO? — curious, what does it take to wash all that soil?

[zdragnar]

Assuming it doesn't break down under electrolysis, the DMSO can be recovered, so you only use as much as you can process at a time.

It is apparently used in some battery chemistries, so I'd expect losses to be pretty low if the equipment is set up well.