here i'll make it easy for you
(and correct this time!)
1. Take your spice and dissolve it in some hot Naptha (1gram/100mL)
2. let this cool to room temperature
3. Add some room temp vinegar to this Naptha and DON'T shake too hard because you'll get some hardass emulsions, just swirl gently for a good aount of time. Let the layers separate and put the vinegar (bottom) in a separate jar. If you have 100mL Naptha then use 50mL vinegar
4. Repeat step 3 two more times, combine your vinegar washes/pulls/extracts
5. Now basify your vinegar, you want to push the pH up around 13. A suggestion on this step: basify the vinegar in the same container you are going to do step 6 in. When you basify your clear looking vinegar you'll suddenly see a lot of freebase spice floating around, if you then pour this into the container to be used for step 6 you'll lose a whole lot of spice as you won't be able to pour it all out.
6. Heat up your vinegar and some clean Naptha, around 50 deg C is fine. Add 50mL of Naptha (assuming you have 150mL of vinegar), mix well and let separate. Keep your Naptha
7. Repeat step six two more times, combine your final Naptha pulls and freeze precipitate for a very clean product.
But anyway dude if you're using MHRB, seeing Noman's or Marsofold's tek on that shows some pretty clean spice anyway.. but doesn't hurt to make it cleaner