hey gone fishin
If your dipping tubes just spray the rods a bit with pam cooking spray and then start dippping them then when cool they come off fairly good
I usually use aluminum rods they seem to work the best
You can heat the plastic on a hot plate or in microwave but if you use a microwave I would get an old junker and dont use the one you use to eat out of because heating plastics puts off some really nasty fumes and arent good to breathe
i dont use scent much but you can mix scent in if its NOT WATER BASED if its water based scent it will start to explode like hitting hot grease with water WOW its not pretty. if you want scent in them you can just add some to the baits you are making in the bag or boxwhen you are finished
Oh and Yes plastic comes out of pyrex cups pretty easy when it cools off