TBH mate, One of the absolute hands down best ways is this
Extract your entire lot with ISO, or Ethanol works too, we are filtering out polar molecules regardless! And in the end, unless you are going for a fully separated THC, CBD, and CBN then you need absolutely a laboratory lolol and a chromatography experience. Really those two alcohols make zero difference, Ethanol just isnt poisonous and is 100% clean. ISO evaporates 100% clean to but is highly poisonous, np there! BTW this is not to deter use from iso, ive used it for years on my extractions and it works TRUE WONDERS! and is 100% safe, clean, and secure for you to use!
But alright, lets say you got a nice chunk of resin now. Its best to let that ISO sit longer then youd normally want (Normally youd wanna leave it there til the liquid itself gets a medium tan colour. Leave it too long and your Hash becomes full of chlorophyl and immense plant fats. )
For this case, you wanna leave it for "too long" simply because of the fact you want to ensure that you are getting 100% of all required materials even plant fats and chlorophyl and other stuffz, because thats to ensure you dont need to do any more then just One single pull the first time. But it helps to keep pulling more out of the material, there is always Resin heads attatched that arent dissolving/breaking off. So get your whole lot of cannabis extracted from.
Then what you truly want to do, is get one of those injecting things that you inject turkeys with flavour. Get a big one! What you want to do, is place a cotton ball (tear off a smaller piece! not the entire cotton ball!) in the end of the tip lightly so you have something to final filter any junk out before you squeeze your solvent/cannabinoid and plant fat mix out through. Then get yourself some Activated Charcoal from like a drug store ANYWHERE haha.
And you may have to repeat this a few times, but place about half a thumbs worth of charcoal into the injector on top of the cotton ball!
Here is where it gets fun, this isnt dangerous in any way shape and form, except for the toxic fumes of iso alcohols. But anyways, you want to dissolve your hash into your ethanol or iso, whatever you have. Then little by little pour your alcohol mixture into your injector, put the top on, and slowly, press the plunger down as you push your alc extract out!
Repeat that a few times but it will clean your plant fats and waxes out. Btw i saw a thread on here from like 5-6 months ago, that was like a bunch of peeps debating whether or not plant waxes are harmful for your body or not.. Guys they arent like candle wax. A plant Wax is a fat, its just like the fat we have. Its the protective layer all plants have. And regardless, 100% of cannabis is safe and healthy for all of us to eat, smoke, and enjoy. Besides the smoke, smoke is smoke. But still wax is in NO WAY unhealthy for you at all. Im a chemist myself and the science of it truly is, is that its a PLANT WAX. not a fake plastic we made out of natural waxes. Plant waxes are nonharmful in any way, depending on which ones you mess with, some are harmful but then again its cause the plant itself is harmful from where you are trying to ingest its wax. Something like cannabis however is not. And if someones lungs are hurting after a "proper" extraction they probably didnt do it proper... Chemistry is a very powerful thing bro!
Please please make sure your solvent is fully dried out of the mix, and fully taken out. Meaning, take a nail and keep playing with it if its a gooey wax or oil like from butane extracts. If its alcohol just make sure the whole plate is dry, then crumble it around and let it air dry for a day or two, then smoke. You never want to smoke concentrate that was freshly evapped. It needs more time to get trace molecules out always. Regardless of safety of solvent it needs to get them out. Alcohol needs to get out, butane needs to get out, everything basically!