Do NOT throw away that iso that is in that little purple bottle that you wash your PD stems in. OMG !!
It's been decades since I smoked any REALLY good hash, so I kinda forgot. Wow.
I clean my stems once a month, and I had about 4 months worth of dirty iso in that bottle. Poured it out into a plate (also iso washed a shot glass that I've been using to cut up my buds) and poured that onto the plate too. Waited about 2 days and then scraped. It was really gooey tar black hash that was super sticky and stuck to everything. Took a bit of it and layed it on top of some bud in my glass pipe and took two hits (forgot that with hash, it's a bit too easy to take a hit that's a bit too big...lol). OMG! It was almost like eating too much of an edible. Soaring, soaring high. Fucked me up for about 3 hours.
Super potent !!