I'll second that. Are you really so eager to have your first breakthrough smoking a tar-like goopy mess? You say that you're planning on doing the extraction tonight... but since you're talking about a 24-hour deal, you'd actually still save time by grabbing some acetone from the hardware store in the morning and doing it then.
Note that acetone won't clean up a crude ethanol-derived extract. The whole idea is that, since the desired chemicals are sequestered on the leaf surface, you do a really quick soak to extract them without the solvent penetrating into the leaf itself and pulling gunky tannins and pigments and things.
Check out Daniel Siebert's 2004 paper "Localization of Salvinorin A and Related Compounds in Glandular Trichomes of the Psychoactive Sage, Salvia divinorum" [Annals of Botany 93(6): 763–771]
(pdf link) for the theoretical details behind the process. Siebert used chloroform instead of acetone, but it's the same idea.
Not sure if anyone has refined the technique, but Sphere's
Salvia Divinorum Extractions using Chilled Acetone (pdf link) gives some hands-on advice on how to go about it.