My chemistry teacher pointed out to our class that "99%" ethanol was distilled in benzene, and therefore had poisonous residue, whereas "95%" was water distilled, and thus safe to spike your OJ.
With the 99% stuff, the laws of physics compells them to use the benzene.
Financial considerations also exert an influence on the process.
Where I am it's called "methylated spirits" and IIRC the boing point of the additive is very close to that of the alcohol so it's not possible to distill it out.
Hopefully the only country with a market for that.