If those 12 hour releif ones are the white ones that are like horse pills, good luck. Those pills can eventually be cleaned, but in SWIMS experience it is way more trouble than it's worth. Trust SWIM. Yeilds on extraction were way low, post rxn workup gave horrifying gunky solids and bad emulsions. Nothing ever can out a whole lot, so fuck em. Stick with the red hots or something. SWIM uses what you could call "white hots". These only contain antihistamine, and two other binders. That all, just two binders, being of magnesium stearate (SP?), and microcrystalline cellulose. No PEG, or povidione, or even waxes!