Wow, after reading through this ENTIRE thread I feel as though I can FINALLY give something back to the people here at FC. I am a seasoned hash oil maker. I am a chemist of sorts(although I haven't worked as one for a while) and I know a lot about thc oil. Basically, I'm saying you can ask me questions and I will see if I can answer.
To all of you who have really bad tasting oil:
You MUST filter out any solid matter from your cleaning. If you do not, the ISO that you are using will take a lot more than just THC out, including chlorophyll and other plant oils that taste and smell terrible! This is an oil maker's worst enemy. Butane does NOT do that at all. It does not take out anything but THC! However, I would NEVER recommend anyone ever use butane because it is EXPLOSIVE. If you light ISO on fire, it will burn about a 4 foot high flame, butane will EXPLODE and you will probably die, or be very badly injured. Alcohol removes ANYTHING and the higher potency the less interaction time you want with the plant matter. The way I clean my GLASS things, is first I pour iso SLOWLY through the stem with my thumb on the smaller end. (I use 91% iso, highest potency I can find without special ordering.) You have to let your thumb off a little to let some air in through the bottom, but catch the few drops that fall on the large flat plate you plan on evaporating on. Once the tube is almost full, cap the other end with your other thumb. Basically what you do now is shake the little bit of air that got trapped in their through the stuck on plant matter to get it off. THIS SHOULD NOT TAKE MORE THAN 30 SECONDS! The less time the better, because you don't want those shitty tasting oils. As soon as most of the shit is off, pour the ISO plant mixture through at LEAST 2 coffee filters. I don't mean put 2 coffee filters together, I mean let one sit on the plate and have one above it using a chem stand or just holding it up. Then pour your mixture through the first coffee filter and let the drips fall into the second coffee filter. Once you are done, you can rerun ISO through the glass piece again to make sure everything is really out. Pour the second run again through the coffee filter setup. Once all is done, you can take the first coffee filter (with the bit of plant matter) and squeeze it out into the second filter. This is really why the second filter is there, because when you squeeze it out the first usually rips. Then squeeze out the second filter all onto a wide plate or multiple wide plates. (depending on how much iso you have used) The best thing here is to let it evap in a well ventilated room with a fan blowing gently over the plate. DO NOT BREATH IN THE VAPORS! Alcohol does evaporate and you CAN breath it in and get "drunk"but the amount can not be measured and therefor should not be attempted because you can pass out in the room and eventually die from breathing in so much alcohol vapor. The thc oil does not smell like weed until ALL of the alcohol has evaporated. The process of evaping usually takes about 8 hours with a fan on. You really have to make sure the plate is completely dry before scraping. You should be able to touch the plate with your hand without anything sticking to your hand. If anything still moves on the plate than it is WAY to early. The way I tell is I wait until the room stops smelling of alcohol and then I touch the plate. If the plate doesn't smell like alcohol, and it is dry to the touch (like a sticky residue but nothing sticking to your hand) then you can get your razor blade and scrape it up onto the blade.
To get it off of the blade you can use a lighter and quickly run the flame over the oil so it becomes wet again and drips off of the blade onto, well, whatever. You can smoke the oil by itself, basically all you have to do is heat up a surface. DO NOT TOUCH THE FLAME TO THE OIL TO SMOKE OR YOU WILL KILL THC BY TURNING IT INTO CARBON. You can heat the bottom of a tin foil spoon or something and drip the oil on that, grab a straw and start sucking. (BY THE WAY YOU CAN NOT TOUCH THE STUFF THAT IS ON THE BLADE! IT SHOULD NOT BE VERY STICKY BUT THE OILS FROM YOUR HANDS CAN CONTAMINATE IT AND MAKE IT LESS QUALITY) What I do is grab some kief or even bud well ground and mix it with the oil until you have some VERY sticky green to work with. The plant matter here prevents the oils from your hand from getting absorbed so no worries about that anymore. YOU NEED A LOT LESS TO GET THE SAME HIGH SO DON'T WASTE IT ALL AT ONCE. Use a little bit at a time until you feel like you are toasted.
Rubber is tricky with ISO. Basically, only food grade rubber is designed to come into contact with alcohol. I don't know what kind you use but you should find out. All rubber is capable of a quick wash however. You can pour the iso straight through the rubber onto the coffee filter setup. I would not recommend soaking rubber in ISO because if you leave it there for too long (I'm talking months but just to show you what I mean) The tubing will be almost completely gone. As for those of you with the glass like rubber problem: the alcohol has absorbed some parts of the rubber unintentionally, another plus for butane but the exploding death thing I think is bad enough to never use it. The rubber is now "cured" and solid. I am pretty sure that if you heat the rubber until it is soft again, and then soak the warmed rubber in oil like WD-40 it should reabsorb the oil and become manageable again. You would then have to do a sand wash afterward to get all of the WD-40 out but it should work. Not sure how safe it is to smoke from though either. Any other questions for me please ask on this thread or PM me.
Safe smoking everyone!