Quote Originally Posted by Coelho
Im sure most other chemicals evaporates also... as their boiling point is lower than waters.

Also... even if there is some chemical which remains in the hash oil, the amount of it is very small
Some high molecular weight organic solvents are VERY difficult to evaporate, even under a vacuum. So that can be a dangerous assumption to make.

As for the amount, I concede that it's likely quite small; however, even tiny amounts of many substances are dangerous and this is something that I would not risk.

Coelho certainly you know what you're doing and it seems you have access to the proper materials so this advice is aimed at anyone who is rooting around under the sink to see what they've got to make hash of, lol.