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 so

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.