ISO does make a really good and tasty extract. I personally put the material in a jar and freeze it. I put the alcohol in the freezer overnight as well. Then I add the two, swirl very lightly for 15-30 seconds, or until I notice the color change. Then I strain with a tea strainer, under that is another strainer with a coffee filter. Then I just let it evap and do its thing.
What do people mean about rewashing? You redisolve the oil with alcohol again?