can't count how many times he sat there dope sick with dozens of empty bags, trying to get something out of them.
First he'd take them all and rub them super hard in all different directions with his thumb and forefinger over a surface, to get all the last dust out. This he'd put in a separate pile.
Then he'd take some hot water, and suck it up in a 1 cc syringe. He'd spray it out into the first bag, swish it around, and then pour it into the next bag. Over and over, occasionally readding hot water since you can't get it all out of each bag. If he felt the water was getting at least mildly potent, he'd pour it in the cooker and start fresh again with the remaining bags. Usually he'd have more water left over than 1CC, so he'd lightly heat it to steam some of the water off. Then add the powder he was able to scrape, and bang it.
The alternative he'd sometimes use was to do step one (rub the bags out as much as possible), and then rip them open down the seams, and take a special toothbrush he kept to brush the rest of the dust out onto the collection surface. Best to do in a completely windless environment of course.